I have had this problem a couple of times, I will be using my computer, and just out of nowhere my monitor goes blank. First time it happened I thought the monitor finally died (It's old), checked cables and such. I had my laptop right next to me, so I plugged the monitor in and it turned right on. Plug it back into my video card, nothing. Generally turning the computer off solves the problem.
Could my PSU (It's a cheap PowMax unit, 18a on the 12v line) not meeting power demands at these points, and sort of shutting the card down? I tempted to put in a different PSU and see what happens, but this problem is very random, and has only happened twice.
PowMax, hehe, ever seen what's inside those things?
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get a Thermaltake 420 watt It runs my cpu with a 6800 gt like a dream havnt crashed once since i got it. heres the Newegg specs from a month ago... its only $36 bucks
Thermaltake Silent PurePower, 420W ATX power supply.UL, CSA, TUV, CE Approved. Intel Pentium 4 Compliant
Model# TT-420AD(DUAL FAN)
Item # N82E16817153006
Maximum Power: 420W
Power Good Signal: 100-500ms
Hold-up Time: >16ms at Full Load
Over Voltage Protection: +5V trip point<+6.8V;+3.3V trip point<+4.5V;+12V trip point<+15.6V
Overload Protection: Not specified
Input Voltage: 115 VAC / 230VAC
Input Frequency Range: 47-63 Hz
Input Current: 10.0A (Measuring 90-132Vrms);5.0A (Measuring 180-264Vrms)
MTBF: Not specified
Approvals: Not specified
Actually I very seriously was thinking about it. I talked to my dad about it. I don't have the know-how to really design something like this, but my dad being an electrical engineer, is capable designing some plans for me to follow. However after talking to him and explaining the kind of amps I would need, he said finding components to handle these kind of amps were kind of limited. In the end he was of the opinion that I probably wasn't going to save much money, and probably just best to buy one.
I have actually run this card and setup off of a CodeGen 400 watt, and to be honest it handle it better (it ran much cooler) than my junk PowMax 480 watt. Both PSU are honestly just cheap generic units, and I figure with the amount of money I have spent on my system lately I think I should be able to afford a decent PSU. I've been using generics long enough I think! Time for something decent, and hopefully something that will run cooler.