PC "shutting down"

[Phaser]

PC powers on as normal, the windows loading screen appears then it just goes into like a standby mode. Everything is still switched on and running but the screen goes off, and the only way of getting it working again is by restarting the machine?

Any ideas?

Cheers.

 

[Phaser]

Everything is fine now.

Weird as last week I didn't get a signal on my gfx card.

Plugged the monitor into the onboard and it was fine.

After all these problems tonight, the gfx card is working again.

Madness! An excuse to upgrade to a nice new machine I think!