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Discussion Starter · #1 ·
Hello all, I apologize for the incoming wall of text, just trying to give as much information as I can.

To give a little background on my situation, I built my computer about a year-and-a-half ago, with nearly all new parts (just reused my old hard drive and CD-drive) and it's been working great since then, with 0 issues.

On Sunday I was playing Supreme Commander when all of the sudden my monitor went nuts and the graphics completely froze up, as did much of the computer. I could still move my mouse, but I could not alt-f4, alt-tab, ctrl-alt-del, etc. I restarted my computer and the 2 first splash screens (the mobo and windows ones) had very patterned artifacts on them. Once windows finished loading it seemed fine, but when I opened fire fox, I noticed that the top bar (file edit view etc.) didn't have the usual smooth gradient that it should, but instead had two shades of gray with a pixelated pattern to it. I turned off my computer, turned it back on, and everything seemed fine. I loaded up WoW (to scared to try SupCom) and everything ran fine.

Tuesday morning I woke up, turned on my monitor and was greeted to a 320x240 resolution screen with an error message "NV4_DISP display driver has stopped working". I restarted my computer and attempted to start up WoW, after getting about 3 letters into my password, the computer locked up in a similar fashion to Sunday's lockup. The screen flickered a little, I could move my mouse, but nothing else was responsive. I restarted. Tried again, same thing. I restarted once more and uninstalled my video card drivers, reinstalled (186.18), and restarted. Loaded up a different game, it froze just like WoW, but just as I was about to hit the restart button, the monitor flickered, the game finished loading and everything seemed fine. I exited, loaded WoW, and it worked. It was working fine for about 12 hours, when I was watching a show on the internet when I noticed the same odd pixelated pattern in firefox, the computer froze in the same previous manner, with only the mouse being movable. I restated, loaded up WoW, got in game just fine, got into an instance when suddenly I saw 2 black bars going across the game (I play in windowed mode). I waited a few minutes and the computer "recovered" but when it came back the game looked horrible, missing textures, black textures, wrong textures. I minimized the game, maximized it and it was fine. I finished the instance no problems.

Last night once again, the computer locked up. This time after restating, I uninstalled my driver, ran driver cleaner 1.5 (the only free version I could find), re-installed an older driver (182.50). This is the driver I used from April to October with no issues. Got in game, worked fine, a few hours later it froze for about 15 seconds then recovered, still with graphical issues (though I could only see about two anomalies in game). Once again minimizing, maximizing fixed these.

Today, after getting yet another lock up and restarting, I had the same weird artifacts on the 2 splash screens, but this time windows loaded into 640x480 mode. I restarted and after the windows splash screen nothing happened, the screen was just black, and the monitor power button light was in the "off" mode. I turned off the computer, unplugged the PSU cord from the power strip, dusted out the power strip, unplugged the power strip from the wall, dusted that out, plugged everything back in, turned the computer on, it started up just fine. Finally at my wits end I came here to try and figure out what exactly is causing all my troubles.

Things I have tried/done.
-I ran memtest all night, 7ish hours, 555% 0 errors, so I don't think it’s my ram.
-Uninstaller, reinstalled my video card drivers, several times, trying different drivers (I've heard some bad things about the latest nvidia drivers, so I haven’t tried those yet)
-Dusted everything out.

I initially thought it was my drivers or my video card, but after looking around some it looks like it could possibly be my power supply.

I'm using:
Windows XR-64 SP2
MSI NX8800GTS 182.50 drivers
Corsair VX550W/VX450W PSU


Like I said, this rig has been running perfectly for a year-and-a-half. I'ts handled everything from WoW to Crysis on full with 0 issues until just these last few days.

Any help would be much appreciated.
 

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Hi, welcome to TSF

From your description and the things you've already tried, it looks like a problem with either the PSU or graphics card, or possibly both if you didn't catch it in time and carried on using the computer after first noticing the artifacts.

NV4_DISP is usually a problem with the driver, but can also be power/heat-related. The Corsair 450W is a good quality PSU, but is only just suitable for an 8800GTS. It has 33A on the +12V line, which is ok, but the power output from all PSUs deteriorates over time. PCIE cards need a minimum of 28A, so yours is borderline.

If possible, check the voltages and temperatures in BIOS.

The latest GeForce drivers, including the new beta, work well in 32bit XP. I haven't tested in 64bit though. As you've been using a known-stable release, it's unlikely the driver has anything to do with your problem.

Test the card in another computer with a suitable PSU to see if it has been damaged. If it works, can you borrow or buy a good quality 650W PSU for your computer?
 

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Discussion Starter · #3 · (Edited)
I looked in the BIOS for the voltages:
Vcore : 1.172V
DDR18V: 1.904V
+3.3V: 3.32-44V
+12V: 11.921V

I also installed speedfan to check my GPU's temp, and saw some very strange readings from the voltage, it says my +12V is only ~2.

As an update to the situation, I tried doing a system restore (in case it was a driver issue) and after getting back in game, after about an hour I got some massive, massive screen tearing, and eventually my computer locked up. After I restarted, I even began getting screen tearing on the desktop itself, and eventually locked up on the desktop. It's currently running stable on the desktop right now as I'm in the process of backing up some key files.

Is it possible to have harmed my CPU/Hard drive at all while using it the last few days if it is indeed my PSU?
 

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The BIOS +12V reading is accurate, but only measures the idle voltages. Speedfan is not very reliable. Try Everest instead (go to Computer>Sensor). Leave it running on the desktop, then alt-tab out of the fullscreen game and quickly take a screenshot of Everest's readings before they start reverting back to normal.

If Everest doesn't show the graphics temperature, use nTune in the nvidia control panel or RivaTuner or ATITool.

As it was running ok in desktop mode for a while, I would expect the +12V to drop significantly under stress in fullscreen 3D mode if there was a problem with the PSU or graphics card.

Have you checked the graphics card fan?

EDIT: If there's a problem with the PSU, it's more likely to damage the graphics card. The CPU will be ok, but there's a small possibility of data loss on the hard drive, so backup anything important.
 

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Discussion Starter · #5 ·
I installed Everest, and it's reading aren't much different than speedfans, it was reading the +12V at about 1.02V idle. I ran WoW for a bit, and didn't see any change.

My graphics card was idling at about 77 degrees, 80 under load, I put a floor fan next to my case and managed to get it down to about 55 idle, 63ish under load.

The fan was one of the first things I checked, and its running and seems fine.

It was after I had brought the video card that low that I got all the screen tearing. I had WoW running for about an hour before the tearing started.
 

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Discussion Starter · #6 ·
I just tried playing a video on my computer. I was met with screen flickering, and an artifacted video. Once I closed out of the player, the screen returned to normal.
 
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