System stability problems, loss of video signal to monitor.

[blueice]

Hi, I have system stability problems with my pc. I have a 1.33ghx Athlon on a Soyo KT-400 platinum mobo. It will not run at rated speed, it loses the video signal even when idle. Running at 1000mhz it is stable when idle but as soon as any video intensive s/w is run like games or 3dmark 2001 it crashes with loss of video signal. This is OS independant as I dual boot 98 and XP and this happens on both. I have read a few threads that suggest that it could be faulty memory or processor and also lots on via chipset being dodgy? I intend to upgrade both the processor and ram when I have the money but would like to find out what's causing the grief. I recently swapped from an Asus A7A mobo because of similar stability problems. This board did work for several years fine until probs arose. I'm hoping it's not the video card. Any help would be greatly appreciated. I unfortunately do not have any other AMD processors or DDR memory to test at the mo.
(Case is heavily modded with several lighting effects, fans, leds and even a d.i.y. water feature but problem still occurs with basic system) Thanx for any help )

AMD Athlon 1.33
GlobalWin CAK-38 hsf
Soyo KT-400 Dragon Ultra Platinum Edition
512Mb (2x256) Crucial PC2100
Gainward GeForce4 ti4600 750gxp Golden Sample
2 Maxtor Diamondmax PLUS ATA-133 40GB
IDE HDD 7200 RPM raid 0 striped
IBM P92 6551 Monitor 19" CRT
Cooler Master ATCs 201 case
Plextor 28x cdrw
Pioneer 16x slot dvd
Win98/XP dual boot
PCMods rheobus

 

[franklin97355]

What do you mean by "crashes"? Do you mean the operating system crashes or do you mean you can't see anything on the monitor? If its the second I would try another video card (even a cheap one)

 

[blueice]

Totally crashes needs reboot to recover. Just tried a Gainward gf3 550 and similar problems occur though not identical. Screen doesn't blank.