I have a Dell Dimension 9190 running Windows XP, 2GB RAM (4x 512MB) about 6 yrs old. Since a few years ago the sleep mode would cause some trouble by not waking up with mouse or keyboard. It required rebooting (pressing the power button) to start up again and I disabled the sleep function (or part of it) long time ago. On this occasion I hit the sleep button by mistake, it went to sleep and has not awoken again. I have tried the following:
- restarting 10 or more times
- removing one stick of ram and reseating it, until all RAM was removed
- disconnecting hard drive, external drives, disk drives, even mouse and keyboard
- replacing the wireless keyboard with USB plugged in keyboard
I get no beeps at all, blank screen, fans whirl, numbers 3 and 4 light up yellow and solid on the front of the box.