Every now and then I get a blank screen when I boot up my pc but when i take out my GTX280. I reset the bios so it uses the onboard. Then plug in my GTX280 again it works fine again. Other than that the system runs fine. I download torrents over night. I played games like crysis on it. Not a hick up in sight.
Today it just randomly switched itself off. Also quite frequently when I switch it on it switches itself off then on again. I have phenom triple core M3NHT deluxe motherboard and a GTX280. I also have 2x 1gb ddr2, dvd and dvd writer and two sata hdds. A creative audigy sound card. My psu is rated 850W. Am I just over straining the PSU?
never even heard of Silver Power (probably because it sucks)
A 650w Corsiar will do.
Thats pretty hastey and may not solve the problem at all.
To the OP, have you checked out a calculator for the power usage of your system.
A quick google search for something like PC power usage calculator should come up with something.
And considering that your PC runs ok during load like Crysis, I would be tempted to say it's not the PSU unless its some serious bargain bin stuff. You'll notice it doesn't pay to cut costs on a PSU when it blows up and takes out half your hardware.
Remember when I had a 600W PSU that cost me £25 a few years pack, plugged in my 8800GT and it actually caught fire... I had smoke coming out the back of my PC!
Took it apart later and there was some ash in a pile where a component was surrounded by a scorched circuitboard.
The 40A recommendation is for the entire system. The card itself only uses about half of that. According to this, your PSU has 4 12v rails with up to 20A each and 63A total. That should be plenty for your setup.
There's a remote possibility that you may be running into some aggressive over-current protection. If you haven't already done so, try powering the graphics card using the 8-pin connector from the the first pci-e cable with the 6-pin pci-e connector from the second cable instead of using the 6-pin connector that's paired on the same cable as the 8-pin.
A bit of a longshot maybe, but the only other options are trying a different PSU or a different graphics card.