All games not working...

I wasn't really sure where to put this so I just decided to here.

Anyway, last week started playing Portal again but as I finished the 1st level, my monitor went blank and a message popped up saying 'Monitor is going to sleep...'. The lights on my wireless keyboard/mouse modem went off (so I'm assuming it turned off). This happened every time I tried it and thinking it was just the game, I gave up.

Just today, I started re-playing Fable: The Lost Chapters. About a minute in, exactly the same thing happened. I tried again, and the same thing happened. I tried with Halo: Combat Evolved and the same thing happened.

I have no idea what's happening so any help would be appreciated.

Thanks,
Jaidyn

Type power in the start search box, Power Options>Change Settings>Advanced Options and see if the sleep time is set too low. If so adjust to your liking. The advanced options will allow you to change many parameters for sleep.

I set it to High Performance. Thanks for your help.

Check your graphics card, I had the same problem, changed GPU, (upgraded) SOLVED.

Hmmmm.... The game lasted 20 seconds longer this time but the same thing happened. Any solutions? Short of buying a new graphics card?

Try downloading GPU-Z Download TechPowerUp GPU-Z v0.5.3 | techPowerUp

Run the program, and select the Sensors tab. Check the options Log to file (accept the default filename and location) and Continue refreshing this screen while GPU-Z is in the background.

Use your computer as normal. The log file will automatically be updated in the background. The next time this happens, check the log file. I suspect that it could be an overheating issue, and that your card is turning itself off.

I have to restart the computer after this happens. I assume the log will still be available after a restart?

It should be. :)

Sorry the power settings didn't help you. Have you changed/upgraded any hardware recently? Aside from a possible graphics chip melt down, there is a possibility of the monitor being bad too. I recently had one go bad after only 18 months.

Is your graphics built-in the motherboard?
EDIT: I checked the spec, yes it is. There is a graphics driver dated 7/15/2010, V8.15.10.2119, check to see if yours is up to date.
New BIOS too 12/8/2010, P5G41T-M LX 0604. There is a beta BIOS listed, but I never use a beta BIOS and don't generally recommend updating unless there is a problem, which you do have.

P5G41T-M LX Downloads

Could be a heat issue make sure all fans are working, and evict all dust monsters from inside the case....