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#1
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No VGA Signal at Native Resolution
I have an HP a6130n desktop, running Windows Vista Home Premium
(32-bit), connected to an HP w17e monitor. It has apparently been working well, but after the PC had been unplugged for a hour or so, the user would lose video on startup. She could see video during POST and Windows startup, but the screen would go black right before the Welcome screen. With the exception of the video, the PC appears to work normally -- you can hear the startup sound, the hard drive works a bit, and it will shutdown normally with a tap of the power button. The monitor LED shows amber, which means no signal. Booting in Safe Mode produces video. A problem, if not *the* problem, is that the system cannot produce video when set to the native resolution of the monitor: 1440x900. Anything less is fine. I've tried the driver that was on the machine, which was probably from HP's factory install, as well as a fresh driver from nVidia. Unfortunately, both of those drivers appear to default the screen resolution to native, so I get no output. By uninstalling those drivers, I can get the system to fall back to a more generic Microsoft driver that defaults to 1024x768, and produces video. I can bump resolution up to 1360x768 with no problems, but 1440x900 again earns me a black screen. I replaced the CMOS battery because of the odd emergence of this problem after the system was unplugged, and because they cost $2. I was not able to try a good, heavy VGA cable to see if that's causing a problem. Other than the wild speculation about the VGA cable, do you have any ideas as to what might be *the* problem? |
#2
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No VGA Signal at Native Resolution
Grinder wrote:
I have an HP a6130n desktop, running Windows Vista Home Premium (32-bit), connected to an HP w17e monitor. It has apparently been working well, but after the PC had been unplugged for a hour or so, the user would lose video on startup. She could see video during POST and Windows startup, but the screen would go black right before the Welcome screen. With the exception of the video, the PC appears to work normally -- you can hear the startup sound, the hard drive works a bit, and it will shutdown normally with a tap of the power button. The monitor LED shows amber, which means no signal. Booting in Safe Mode produces video. A problem, if not *the* problem, is that the system cannot produce video when set to the native resolution of the monitor: 1440x900. Anything less is fine. I've tried the driver that was on the machine, which was probably from HP's factory install, as well as a fresh driver from nVidia. Unfortunately, both of those drivers appear to default the screen resolution to native, so I get no output. By uninstalling those drivers, I can get the system to fall back to a more generic Microsoft driver that defaults to 1024x768, and produces video. I can bump resolution up to 1360x768 with no problems, but 1440x900 again earns me a black screen. I replaced the CMOS battery because of the odd emergence of this problem after the system was unplugged, and because they cost $2. I was not able to try a good, heavy VGA cable to see if that's causing a problem. Other than the wild speculation about the VGA cable, do you have any ideas as to what might be *the* problem? The fact that it is VGA, takes all the fun out of it. There are more ways for DVI/HDMI to screw up, than VGA. Perhaps you could review the EDID the monitor is passing ? http://www.entechtaiwan.com/util/moninfo.shtm Maybe the video card is delivering 1440x900 but at the wrong refresh rate ? Paul |
#3
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No VGA Signal at Native Resolution
On Mon, 31 May 2010 23:09:12 -0500, Grinder
wrote: I have an HP a6130n desktop, running Windows Vista Home Premium (32-bit), connected to an HP w17e monitor. It has apparently been working well, but after the PC had been unplugged for a hour or so, the user would lose video on startup. She could see video during POST and Windows startup, but the screen would go black right before the Welcome screen. With the exception of the video, the PC appears to work normally -- you can hear the startup sound, the hard drive works a bit, and it will shutdown normally with a tap of the power button. The monitor LED shows amber, which means no signal. Booting in Safe Mode produces video. A problem, if not *the* problem, is that the system cannot produce video when set to the native resolution of the monitor: 1440x900. Anything less is fine. I've tried the driver that was on the machine, which was probably from HP's factory install, as well as a fresh driver from nVidia. Unfortunately, both of those drivers appear to default the screen resolution to native, so I get no output. By uninstalling those drivers, I can get the system to fall back to a more generic Microsoft driver that defaults to 1024x768, and produces video. I can bump resolution up to 1360x768 with no problems, but 1440x900 again earns me a black screen. I replaced the CMOS battery because of the odd emergence of this problem after the system was unplugged, and because they cost $2. I was not able to try a good, heavy VGA cable to see if that's causing a problem. Other than the wild speculation about the VGA cable, do you have any ideas as to what might be *the* problem? I suspect I came across this issue a few weeks ago - but I do not remember all the details. Basically the video is detecting the monitor as a TV and going into a mode (480i?) the monitor can't support. It does this when windows finishes booting because that is when the driver loads. Why it is doing it now after the system was unplugged I can't say unless there is a bios setting that was lost due to a low battery. Anyway, install the most recent driver from nvidia.com, boot windows to vga mode from the boot menu (not safe mode which may not give you the driver loaded so the control panel for video is castrated), then go into the nvidia control panel and set the monitor type to "digital" instead of (whatever the other choice is, it seems like analog or tv would be the other choice but the exact word it was I don't recall). Next, reboot the system to normal mode (regular boot). I wish I remembered more about the problem but I was really busy that day. It might've been an nForce 2 chipset's integrated video, I can't remember which system that was but it may apply to more chipsets than just one. |
#4
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No VGA Signal at Native Resolution
On Tue, 01 Jun 2010 22:55:54 -0400, kony
wrote: ... then go into the nvidia control panel and set the monitor type to "digital" instead of (whatever the other choice is, it seems like analog or tv would be the other choice but the exact word it was I don't recall). Next, reboot the system to normal mode (regular boot). Above I mean set it to digital even though it is an analog output you are using. However, I vaguely recall nVidia changed their control panel with the very newest drivers, I was previously referring to any driver with the 190 series control panel including what you probably got from nvidia.com last time. It might've been a setting in the TV setup wizard, I can't remember. Just look around till you see a choice between digital and something else with it defaulting to the something else and set it to digital. |
#5
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No VGA Signal at Native Resolution
On 6/1/2010 9:55 PM, kony wrote:
On Mon, 31 May 2010 23:09:12 -0500, Grinder wrote: I have an HP a6130n desktop, running Windows Vista Home Premium (32-bit), connected to an HP w17e monitor. It has apparently been working well, but after the PC had been unplugged for a hour or so, the user would lose video on startup. She could see video during POST and Windows startup, but the screen would go black right before the Welcome screen. With the exception of the video, the PC appears to work normally -- you can hear the startup sound, the hard drive works a bit, and it will shutdown normally with a tap of the power button. The monitor LED shows amber, which means no signal. Booting in Safe Mode produces video. A problem, if not *the* problem, is that the system cannot produce video when set to the native resolution of the monitor: 1440x900. Anything less is fine. I've tried the driver that was on the machine, which was probably from HP's factory install, as well as a fresh driver from nVidia. Unfortunately, both of those drivers appear to default the screen resolution to native, so I get no output. By uninstalling those drivers, I can get the system to fall back to a more generic Microsoft driver that defaults to 1024x768, and produces video. I can bump resolution up to 1360x768 with no problems, but 1440x900 again earns me a black screen. I replaced the CMOS battery because of the odd emergence of this problem after the system was unplugged, and because they cost $2. I was not able to try a good, heavy VGA cable to see if that's causing a problem. Other than the wild speculation about the VGA cable, do you have any ideas as to what might be *the* problem? I suspect I came across this issue a few weeks ago - but I do not remember all the details. Basically the video is detecting the monitor as a TV and going into a mode (480i?) the monitor can't support. It does this when windows finishes booting because that is when the driver loads. Why it is doing it now after the system was unplugged I can't say unless there is a bios setting that was lost due to a low battery. Anyway, install the most recent driver from nvidia.com, boot windows to vga mode from the boot menu (not safe mode which may not give you the driver loaded so the control panel for video is castrated), then go into the nvidia control panel and set the monitor type to "digital" instead of (whatever the other choice is, it seems like analog or tv would be the other choice but the exact word it was I don't recall). Next, reboot the system to normal mode (regular boot). I wish I remembered more about the problem but I was really busy that day. It might've been an nForce 2 chipset's integrated video, I can't remember which system that was but it may apply to more chipsets than just one. The system in question is using an integrated GeForce 6150LE with a VGA output. |
#6
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No VGA Signal at Native Resolution
On 6/1/2010 10:02 PM, kony wrote:
On Tue, 01 Jun 2010 22:55:54 -0400, wrote: ... then go into the nvidia control panel and set the monitor type to "digital" instead of (whatever the other choice is, it seems like analog or tv would be the other choice but the exact word it was I don't recall). Next, reboot the system to normal mode (regular boot). Above I mean set it to digital even though it is an analog output you are using. However, I vaguely recall nVidia changed their control panel with the very newest drivers, I was previously referring to any driver with the 190 series control panel including what you probably got from nvidia.com last time. It might've been a setting in the TV setup wizard, I can't remember. Just look around till you see a choice between digital and something else with it defaulting to the something else and set it to digital. Can do -- thanks. |
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