Secondary Monitor Loses Signal and System Freezes

[DialerDave]

Okay, here's the problem. The system boots up fine, runs as fast as always, but recently, for no apparent reason, the secondary monitor goes black as if it lost signal and the entire system freezes. The only thing I can do is manually shut off the system. It even happens when I'm not using the computer. I have an ASUS A7N8X-E Deluxe running an Athlon 3200, Radeon 9800 Pro, Ati TV Wonder Pro, and SB Audigy 2 Platinum. Also, I have sp2 and ultramon installed. Please somebody help me!

[DialerDave]

I have no screen saver on, and my power settings are set to never turn off. My power supply is a 520 watt. I had a problem similar to this a while ago, but it only happened when I played games at high res and I fixed that by taking out a couple of hd's I had on a controller card. I have two sata hd's and one ide, so could it be a power problem?

[sr71000]

i suppose it's possible but probably not. If it just happened when u played high res games i'd say u'r stuff was pulling more outa the psu and messed up..makes sence but if it happens even when it's idling..i'd say reinstall all your drivers and multi-monitor software, just to make sure nothing was corrupted!

[DialerDave]

Ok, I've tried a different video card, and for a while the new card worked, but now it freezes as well. It also freezes when the secondary monitor isn't enabled. I've had the computer for over a year and no problems. When I get home I'm going to reinstall my video card drivers and you said sr71000, and I'm also going to run memtest. Could it be my motherboard or psu? Btw, my temps are fine, never goes above 120F unless playing games, but then it doesn't go above 130F. I've read in another thread to try unplugging any usb devices and the modem. I guess I'll give that a try as well.

[skeltonjoe]

one owrd RAM i want you to download memtest86 you can find it in google and run it till you get to test 7 if there is any errors its def. your RAM and this seems like a RAM problem then you need to isolate the damaged chip by running memtest on one chip in the pc at a time to find out which one it is