The other afternoon i decided to install an application from a thumbdrive from my other Pc. The program was 'Open Office' (.exe)
So i left it to install (as it was taking a while and my tv show was on). And the computer went into sleep mode i clicked the mouse but nothing happened and the laser had turned off. My keyboard didnt work and the lights froze on capslock and num lock.
So i turned the computer off by holding the power button. I pressed the power button and the computer failed to start, so I pressed the menu buttton on the monitor and it read: "In power save mode move the mouse or press any key to continue." I turned the computer off again and tried to reboot and the same thing happened. So i turned off the power and replugged all of the cords. turned the computer on again and the same thing happened, it appears to be in sleep mode.
The computer turns on, the fans working and the lights are all on like normal except for the one on the CD ROM, it usally just stays on unless you eject the disk where it flickers, now it doesn't seem to stop flickering. Ive have briefly checked the inside of the computer to check if anything was burnt, broken, etc. But it was exactly how i left it when i checked wether i could put my new computers old graphics card (but it couldn't). Btw the computer is a bit dusty, could do with a clean not sure if that would help.
So overall the computer was working fine, it went to sleep and hasn't ever waken up since, even when i reboot the system. The computer is about 5 years old, and is a Dell Desktop on Windows XP sp3.