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#1
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Computer won't start
Hello,
I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. I've let it run for a while, but the state does not change.... it's broken :s Any ideas what might be causing? Thanks, twomt |
#2
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Computer won't start
"twomt" wrote in message ... Hello, I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. I've let it run for a while, but the state does not change.... it's broken :s Any ideas what might be causing? Thanks, twomt Try resetting the bios. There is usually a jumper near the cmos battery |
#3
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Computer won't start
philo wrote:
"twomt" wrote in message ... Hello, I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. I've let it run for a while, but the state does not change.... it's broken :s Any ideas what might be causing? Thanks, twomt Try resetting the bios. There is usually a jumper near the cmos battery Thanks, I might give that a go... trying to locate jumper :P |
#4
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Computer won't start
"twomt" wrote in message
... Hello, I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. You say "the" fan is spinning. There is only ONE fan inside your computer? Which one is spinning? CPU, power supply, case fan, what? There should be 2 fans at a minimum: one for the CPU and another inside the power supply (it must have 1 fan at a minimum but sometimes it has 2 fans). Even if the PSU fan is thermally controlled, it should always spin. Same for the CPU fan. If either of those are stopped, you have a problem. The PSU fan is used as the minimal air flow generator for your box. Besides cooling off the PSU, it draws air through the case to cool the rest of the components. The CPU fan must obviously be spinning to cool off this hot component. When you power on the computer, do you hear it beep? After you see the LEDs flash, several seconds later should be a beep which is the BIOS telling you that the POST has successfully completed. An internal speaker must be connected to the motherboard to hear this beep. If you have an internal speaker hooked up and you don't hear the beep then you might have to go to the last step where you revert to a minimal hardware configuration to test your system. Make sure the monitor is powered on before powering on the computer. Some monitors deliberatly remain blank when they are first powered up. If you use a power strip to power up all devices simultaneously then the monitor may simply not be presenting you with a display to show the problem before it gets cleared from the screen. Does your startup of operting system generate any sounds, like an OS startup sound event or beeps? I don't mean beeps from the POST complete event in the hardware. I mean noises produced through your speakers by sound events that you defined in your OS that you could hear when the OS loads. If you hear those sounds then your monitor is bad and why it always looks black although the OS really did load. Before the system BIOS loads, the video BIOS loads first because, well, you need to see the POST results. That's why the first thing seen is the BIOS post from the video card at the top of the screen. However, even before that the CPU pulses the reset line to ensure all devices are returned to their base state which is why you saw the LEDs flash on the keyboard. If the video card is bad then you won't see anything regardless of successful POST and OS load. You say that the monitor always remains black which makes it suspect because you should, at least, see its post output at the top of the screen. Of course, a bad monitor would also prevent seeing anything that was being output by the video card. Check the cables between the video card and monitor. If you get to the POST screen (doesn't sound like it, though), check the hard drive is working. When powering up, listen to the hard drive (remove the side panel to hear the hard drive) which should exhibit a whine noise as it starts to spin up. Although you may not get to the POST screen, you can still clear your CMOS by jumpering across the 2-pin header with a jumper. Leave the jumper on for a minute and then remove (or leave attached by using just one pin). If the CMOS gets corrupted then it may not allow the firmware in the BIOS code to load because the parameters are too screwed up. If that fixes your problem, you should replace the battery. Lastly, revert to a minimal hardware configuration. Remove power plugs from all optical drives, all hard drives except the one where the OS is installed, floppy drives, sound cards, data/fax modem card, and everything from all the slots except the video card. The idea is that you might have a failing PSU that can no longer supply the current needed by the load from all the devices or one of them has failed is causing the host to not boot. You should then only have the PSU connected to the motherboard, maybe the video card, and a hard drive. If it still refuses to boot to the POST screen, remove all memory sticks but one and try again, and cycle through each stick at a time if the host still fails to boot. I've had power supplies that were high quality that still went defective after around 3 to 4 years because of loss of voltage regulation (too much ripple) or could no longer supply the amperage needed by the existing equipment which hasn't changed. The PSU is the life's blood of the computer and way too many builders go too cheap and rely on the specs which many PSU makers stretch way too far for the capacity of their product. If you get a cheap quality PSU then figure your max sustainable load will be two-thirds of their rated wattage. |
#5
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Computer won't start
On Dec 27, 12:04 pm, twomt wrote:
Hello, I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. I've let it run for a while, but the state does not change.... it's broken :s Any ideas what might be causing? Thanks, twomt Has the PC been OK till recently? Have you done anything to make a difference recently? What windows are you using (if any)? Do you have any kind of boot disk? Do you get past the POST screen at all....like to go into Bios? Can you find access to the 'net (like a buddies PC) where you could d'load a boot disk from a site I could direct you to? |
#6
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Computer won't start
OK,
root cause located and resolved. The fan on my gfx-card had given up and fried the processor. I've just installed a new gfx-card and all works fine again. Thanks a lot for all the help people. Regards, twomt -- Nemesis War Online browser based space combat game. It's free, it's great, you'll love it. Come join us at http://www.nemesiswar.net/ |
#7
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Computer won't start
"Joel" wrote in message news twomt wrote: OK, root cause located and resolved. The fan on my gfx-card had given up and fried the processor. I've just installed a new gfx-card and all works fine again. Thanks a lot for all the help people. Glad to hear you get the problem solved, and THANKS for updating what causes the problem. Yep! Thanks for the feedback |
#8
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Computer won't start
In trouble shooting, It's always:
(1)power source (2)cable connection before you do any other stuff. jennifer http://www.powersupplycables.com |
#9
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Computer won't start
twomt wrote:
I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? First step is to disconnect everything but cpu fan, ram, video card. -- http://www.bootdisk.com/ |
#10
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Computer won't start
Joel wrote:
twomt wrote: Hello, I fear I have a hardware problem somewhere, can someone give me some hints on how to locate the root cause? The computer is getting power as the fan is blowing normal and the keyboard lights (caps-lock, num-lock and scroll-lock) blink once when I press the power button. Then it all stops, well... the fan continue to blows but nothing else happens. This is before the bios screens come up when you initially start your computer. The monitor turns itself off saying it does not receive a signal, the keyboard is not responding to anything (normally, num-lock would show the light on/off) and my optical mouse is not showing the red lights it normally does. I've let it run for a while, but the state does not change.... it's broken :s Any ideas what might be causing? Me? these are what I usually do. 1. I read and learn thing *before* thing starts happening to my system as many and I doing at the moment. What I am trying to do is encouraging others to take a opportunity for future problem. 2. I would try to see *if* it causes by hardware or software. - Hardware - I would go to CMOS setting screen, and often most problems solve itself just by entering the CMOS setting. Or usually the CMOS will detect something changed and recogize and fix itself. Then check either Power-supply, memory, video, audio cards etc. make sure them have good connection. - Software, then sometime just boot to .. I forget what it's called .. ohh "Safe Made" can sold some software/hardware related issue itself. Or on safe mode Windows may have to load some specific program, then update the working Windows to normal boot. Yes, sometime it's so weird but works sometime Or booting using util like util called "Winternal" and I don't know exactly what it does, but my systems with booting issue were solved by just boot with "Winternal". But I ain't recognize to jump straight to Winternal without taking a chance to learn what's going on. Thanks, twomt 1. I am not getting this statement... 2. CMOS, as I wrote the PC locks up / stops booting before this point. I haven't been able to get into the CMOS. Because it already happens at this point, I am suspecting a hardware or bios issue. If it was software, I would imagine that it would stop only at a later point. I've already unplugged the cards and stuck them back in, no change. As most of the stuff is on-board, I can't do a lot with it anyway. The other option to reset the CMOS is probably the best way to go forward for now. And perhaps to find a spare-parts PC that I can use to see if I can locate the root cause. But thanks for your response anyway. |
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