Thanks but I’ve discarded any hw issue. It would affect most programs or preferably the most demanding, in watts, processor use, videocard use or anything. The computer has a lot better PSU and cooling than actually needed (I called it “standard” but it has been designed and built by an enthusiast with high quality although not extreme stuff, not by a manufacturer using a rational and economic approach; for instance it has a carefully choosen 120mm exhaust fan and a processor HSF adequate for double the power, so you hardly see it above 50ºC, only in summer while doing compressed partition backups). The point is that neither Windows Search nor Event viewer are “heavy gaming” or even “heavy use”.
I’ll try reinstalling the GPU driver. It shouldn’t hurt (specially with a previous image backup just in case).
The OS install is from 2007 and for sure has developed failures. I would have to reinstall XP but “the system” is in war against XP and the system is powerful so I’m trying to avoid it. For instance my computer has complained about “lack of resources” when trying normal installs or uninstalls of sw. It’s a sw problem so no wonder. This is possible, likely, it doesn’t attack the gravity law.
If Windows Search or Event Viewer were just hanging or throwing strange errors, no wonder. But they’re attacking the video output, even managing to alter the video mode (to an illegal one to boot). And only they do it. Blinks alone aren’t that hard to get but something must affect the DVI transmitter, so that the monitor “doesn’t understand” and goes to black. How can these light desktop utilities, and only they, affect the DVI transmitter? What is the relation? I’m stunned.
Notes on the hw:
This rig can do much heavier things than doing Windows Search or Event Viewer. It can visit heavy web pages, doing partition images with compression, Media Player, at least one game full screen (although ancient and not demanding, Timeshock! that requires win98 compatibility setting for the sound, the card is DX 8.1 anyway).
The PSU is a Corsair VX450 with a single 33A +12V rail. It is for another class of hw, it could feed my other rig based on a 3,2GHz Deneb X4 125W and a 4890 190W but possibly 130-140W in practice, that totals 330W in 3dMark06 at maximum, but it’s feeding a 65W processor and a 35W video card that doesn’t have power connectors (nor fan) (AGP bus is limited to 42W) (the heatsink feels somewhat hot so it’s dissipating well). A DVD drive idle is about 5W and the HD 10 Watts at most (when I was more at this I heard an HD can consume like 25W when switching on and that there were/are mobos that can switch the HD’s on one by one to avoid power issues, but I only have one HD and no problems at boot up, the HD only stops when I turn off the computer so there’s no extra power for using it).
Previusly this rig had a more powerful videocard (an X1950pro 70W, that had molex connectors in fact), but it broke 2 months ago (system wasn’t posting and I had to detach everything except processor and listen beeps etc to diagnose). Consumption was 190W maximum with the ancient card, so it should be like 160W during heaviest gaming now.