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#1
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BX6 rev2 boot problem
Here's the problem. my wifes PC WAS working absolutely fine most of the time but more and more often it started to switch off with NO warning at all. It then would'nt even POST when I attempted to restart. No bios screen no hard drive activity no CPU fan. The PSU fan would be on and the RED HD light would be permanantly lit until I disconnected both the CD Rom drive and switched the pc off at the back. It would then boot as normal when I reconnected them. But as of today it will now not start-up at all. Still PSU fan noise and permanent red light at front of case but thats as far as it will go even after being left unplugged for 2 hours. Here's what I've done so far to troubleshoot the problem.... when the machine WAS working of course. 1....Removed cd rom power and ide cables ..still failed after a few days. 2....Booted from floppy and used 2 different DOS ram testers and left them running for 10 hours .. NO faults reported. 3....Checked the temp of the cpu which was fairly normal (38c in bios). 4...Within Windows Xp (Sp2) .. ran 3d mark2001 and prime 95 seperately and together to try and test CPU/RAM & video card to force a crash .. no failures after 10 hours of testing. And these extra things I've tried today in an attept to revive the machine 1 . Disconnected all ide drives .....still no boot 2. Tried working cmos battery ...still no boot So I've tried ALL I know.. can anybody give me any more ideas .. can the PSU be dead even if he fan on it is working. and giving out power to the led ? I've now left it overnight the PC will now post and let me into bios. on each boot it now shows post screen detects cpu, harddrive and updates ESCD then resets EVERY time. Today I've tested PSU with multimeter and found it to accurate on each Molex connector and also on the ATX 20 pin power connector pins to what the manual states AND various tech sites on the net. I've replaced the cpu with another ..Exactly same ..still no boot I've replaced Video card with another .............still no boot I've now removed sound card and network card ..... still no boot. I CAN boot with floppy and used the hard drive util from Maxtor .. It passes all manufacturer tests. When booting from floppy I can "see" the Hardrive and its contents ! So it's even more confusing now .... perhaps the HD boot block is now corrupt, but would that make the machine reboot....I would have thought a bad boot block would just throw up an error message or something ?? *********************************************** PC stats are as follows... Abit bx6 (rev2) ************ Cpu P2 266 (slot 1) 320mb edo ram 1 Maxtor 30gb HD ....own IDE channel 1 DVD rom drive .own IDE channel Geforce1 256DDR .................................AGP slot 3com Ethernet 10/100 card..........................pci 2 SB 128............................................pci 4 |
#2
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Did you check the capacitors? See Homie's site:
http://motherboardrepair.com/ Forrest Motherboard Help By HAL web site: http://home.comcast.net/~mobo.help/ On Wed, 29 Sep 2004 21:43:14 +0100, "Ian" wrote: snip PC stats are as follows... Abit bx6 (rev2) snip |
#3
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Cheers HAL,
.... Very good info I'm looking into it ..!!! Latest UPDATE on my problem if you can be bothered ...can you advise more ?? The BOOTING RESET was caused by a screwed XP installation (agp440.sys) caused by the last cut-out ..as a repair of Xp sorted it out). .. still doesnt explain WHY these cut outs happen though. So its back to normal completely although without sound card & nic for the moment . As before it seems rock steady and will pass all benches/tests I can thow at it. But one day I'll simply cut out I'm pretty convinced as I've changed nothing ..weird ! As you may have read I did TRY another CPU (and cleared bios) and although it made no diffrence to the booting problem. I've noticed that when I did all my probing with my meter when IT was installed ALL the voltages looked well within the limits and the +12 was always between 11.81 & 12.10. BUT tonight I've put the original CPU back in and noticed in Bios sensors (haven't had time to probe with meter yet) that the +12V was fluctuating from around 8v to no higher than 11v the whole time I was observing & the CPU fan would slow as the voltage dropped. This definatly did not happen with the other CPU installed. So I'm now thinking that somehow this CPU is dragging the voltage down and this has been causing the resetting symptoms described over the last 6 months or so. Not sure if it possible for this to be the cause but I've chaged nothing else tonight ... any ideas mate ??? |
#4
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My problem is that I'm not familiar with this board. Also, I've not
had a mobo with a capacitor problem - I've just heard lots of others talking about it. You might try the more popular abit newsgroup: alt.comp.periphs.mainboard.abit Also you might try emailing homie and describing your voltage fluctuations. Also tell him the operating frequency of both cpu's as cpu power consumption is related to cpu frequency. Of course it could just be a power supply problem. Might want to ask around and see if anyone will lend you theirs for a quick test. Forrest Motherboard Help By HAL web site: http://home.comcast.net/~mobo.help/ On Fri, 1 Oct 2004 00:10:11 +0100, "Ian" wrote: Cheers HAL, ... Very good info I'm looking into it ..!!! Latest UPDATE on my problem if you can be bothered ...can you advise more ?? The BOOTING RESET was caused by a screwed XP installation (agp440.sys) caused by the last cut-out ..as a repair of Xp sorted it out). .. still doesnt explain WHY these cut outs happen though. So its back to normal completely although without sound card & nic for the moment . As before it seems rock steady and will pass all benches/tests I can thow at it. But one day I'll simply cut out I'm pretty convinced as I've changed nothing ..weird ! As you may have read I did TRY another CPU (and cleared bios) and although it made no diffrence to the booting problem. I've noticed that when I did all my probing with my meter when IT was installed ALL the voltages looked well within the limits and the +12 was always between 11.81 & 12.10. BUT tonight I've put the original CPU back in and noticed in Bios sensors (haven't had time to probe with meter yet) that the +12V was fluctuating from around 8v to no higher than 11v the whole time I was observing & the CPU fan would slow as the voltage dropped. This definatly did not happen with the other CPU installed. So I'm now thinking that somehow this CPU is dragging the voltage down and this has been causing the resetting symptoms described over the last 6 months or so. Not sure if it possible for this to be the cause but I've chaged nothing else tonight .. any ideas mate ??? |
#5
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On Fri, 1 Oct 2004, - HAL9000 wrote:
Of course it could just be a power supply problem. Might want to ask around and see if anyone will lend you theirs for a quick test. I have an Abit BE6 and had similar problems. Changing the PSU made the problems go away and it has been fine ever since. David -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
#6
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Just add a finish to this thread .. I sourced a dry solder joint on the ATX
power supply to MOBO ... which when moved caused voltages to drop to as low as 8v on +12v rail. Resoldered it and all voltages are now normal and rock steady ! All problems have dissapeared (o: Cheers all who put me in the right direction. "David Rance" wrote in message ... On Fri, 1 Oct 2004, - HAL9000 wrote: Of course it could just be a power supply problem. Might want to ask around and see if anyone will lend you theirs for a quick test. I have an Abit BE6 and had similar problems. Changing the PSU made the problems go away and it has been fine ever since. David -- +-------------------------------------------------------+ | Internet: | writing from | | Fidonet: David Rance 2:252/110 | Caversham, | | BBS: telnet://mesnil.demon.co.uk | Reading, UK | +-------------------------------------------------------+ |
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