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HELP - PC monitor randomly turns off (power on) but pc does not shut down


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16-Aug-2012, 10:33 AM #1
HELP - PC monitor randomly turns off (power on) but pc does not shut down
Hi

I reformatted my PC a few days ago and since then the monitor keeps shutting down randomly. The screen goes black and message 'no signal detected' appears then screen turns off, although power remains on (monitor power light turns to amber). The pc itself remains on and running - it doesn't shut down. I then have to shut down and turn pc back on manually.

Last night when watching a video file, screen blacked out and shut down. The audio of the video file also crashed so I assume it caused a problem to the pc? I'm not sure. If it didn't, surely the audio would continue.

The monitor is running of the onboard graphics card (motherboard) and bios setting is set as 'onboard VGA enabled' - my graphics card doesn't work and haven't had time to replace yet. My monitor has been running off the onboard VGA for a while now without any problems until I did the reformat.

I have checked cables and heating and can't find the problem. Please help!

Thanks
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16-Aug-2012, 11:10 AM #2
Go into your power settings and set sleep mode of the monitor and computer to never.
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17-Aug-2012, 01:24 PM #3
I have done that already and everything is set to 'never' turn off.
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17-Aug-2012, 01:53 PM #4
Please use this to give us your specs
http://static.techguy.org/download/SysInfo.exe
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17-Aug-2012, 02:17 PM #5
You might, if not already done, move the monitor to a different computer and see if the problem follows the monitor, or remains with the other PC. If you have the ability / 2 pc's available.

I recently had a similar issue, after rebuilding a pc and replacing the video card (was slowly failing) my monitor was flickering. I thought the new video card was to blame. However, it was actually the power supply of the monitor causing the problem. Repaired and all is working proper. I determined this by swapping monitors (followed the monitor) and then swapping the power supply (brick type) and it followed the power supply.

In your description, I would lean toward a failure of the video card. Mainly because the monitor is losing video signal. However, is could also be the monitor. Hard to know. The best way to diagnose such problems is swapping out components to isolate the problem. Often that will narrow it down, and the solution is often a replacement of the entire component.
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17-Aug-2012, 03:13 PM #6
Here's my specs:

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft® Windows Vista™ Home Premium, 32 bit
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, x64 Family 15 Model 75 Stepping 2
Processor Count: 2
RAM: 2941 Mb
Graphics Card: ATI Radeon Xpress 1150, 128 Mb
Hard Drives: C: Total - 238472 MB, Free - 157566 MB;
Motherboard: ASUSTeK Computer INC., M2R-FVM
Antivirus: Norton Internet Security, Updated: Yes, On-Demand Scanner: Enabled

I have another monitor so will try swapping to see if it is the monitor or the graphics card.
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17-Aug-2012, 03:22 PM #7
Have you checked for driver updates for your motherboard?
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17-Aug-2012, 03:23 PM #8
Is there a reason your not doing updates? Your missing two VERY important ones in Service Packe 1 and SP2.
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17-Aug-2012, 03:26 PM #9
Thanks captainron I missed that.
Definately update windows first!!
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17-Aug-2012, 03:34 PM #10


Service Pack 1 & 2 can be downloaded and installed without using the Windows Update feature. It is much quicker this way. Install SP1 first and reboot. After you have finished installing SP2 reboot then use Windows Update to finish updating your system.

http://www.microsoft.com/en-us/downl...ils.aspx?id=30
http://www.microsoft.com/en-us/downl....aspx?id=16468
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17-Aug-2012, 04:56 PM #11
I thought the SP1 & SP2 was installed as when I checked the Windows update list, SP1 and SP2 was listed as installed successfully. Is there any harm in installing them manually?
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17-Aug-2012, 06:03 PM #12
Right click on Computer and see if SP1 or SP2 shows up. It did not show up when you posted the Tech Support Guy System Info Utility version 1.0.0.2.
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17-Aug-2012, 07:03 PM #13
You're right. SP1 & 2 was not installed. I have just installed SP1 manually and it now shows when I right click Computer. I will install SP2 and see if I still encounter problems with the monitor.
Thanks!
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17-Aug-2012, 09:07 PM #14
Good luck, and remember to use the Windows update feature to get all caught up after you do the SP2 update.
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21-Aug-2012, 04:33 PM #15
Ok, SP1 & 2 installed and Windows update completed all updates on the system. I'm still having the problem.

I have checked for updated driver - windows tell me the latest driver for the display is installed.

I will try another monitor though I am doubtful this will help, unless there is another solution?
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