I'm not sure if this is a software of hardware problem, so I'll just post it here...
My system is:
Amptron Motherboard (low-end)
2 GBs of RAM
Whenever my computer starts Windows 7, it will enter for a while (a few seconds to a few minutes), and then the screen will go black.
At this moment also, my mouse acts as if it loses power (the blinking lights go out)
My keyboard also acts as if it loses power (The Numlock or Capslock light will go out)
But, the system is not shut down, because the processor fan is still running, the LED lights still on, etc.
My monitor will say No Signal Found
If I press a keyboard key, let's say the Capslock key, the monitor starts again, as if aroused from a deep sleep.
The screen will be at the log in
I'll click my account, and I'll be into Windows again, with precisely the same condition (same programs open) as when the screen went black.
After a while (a few seconds until a few minutes), the same thing will happen. The screen will go black, my peripherals seems to lose power, but my computer still running. Hitting a keyboard key will bring me back to the log-in screen.
After a few cycles like this, the computer can decide to shut itself down.
At first I thought this has to do with my power plans. But I've put the Sleep to Never, and the Shut Hard Disk to never, and this still occurs.
I'm really not sure if this is hardware or software. This is very strange. I'm not a junkie, but I'm not a newbie either. I know my way around computers, I've built quite a few, but this is the first time I've seen something like this.
If anybody can shed some light on this, I'll greatly appreciate it. Thanks!
Did this computer work properly before W7 instalation? did you clean install or upgrade?
Do you have the latest video card drivers, check the makers website for latest version.
If all else fails try reinstalling W7.