I did a hard reboot on my mom's Dimension 4400 (which means I took out the battery and RAM and put them back in again) effectively resetting the board.
I had to do this because my mom put it into hibernate mode and we couldn't get it out (of hibernate). So I did, and it didn't do anything for hours, then suddenly booted up and made all kinds of noise and came on with the POST screen, but with 2 errors: "CMOS display type wrong" and "CMOS date/time wrong".
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You should replace the old CR2032 coin cell battery on the motherboard. It's a $3 battery sold in any store. To reset the cmos to the correct settings you have to enter the bios and change the settings that were changed when you reset the bios to the defaults. Not all of the defaults are correct for your computer. Tap F2 as soon as you reboot. Don't wait for any screen, just start tapping as soon as you reboot. If you are not familiar with resetting the bios values, get someone to help. You can cause major problems and complete failure if you change something you shouldn't. BTW, a hard reboot is forcing the computer to shutdown by holding down the power button until it shut off, not reseating memory and removing the battery.
Unfortunately, another problem is that it won't accept any key input except "delete" when it's first booted up. Then, it won't let me change any values that might actually matter, like the boot sequence or the peripheral settings. In the BIOS, it just won't let me go into certain menus -- almost like it's locked or something, which I didn't think was possible. Once, I got past the BIOS, and then it popped up with a dialog box asking which drive it was supposed to boot from -- only, there weren't any drives displayed that I could select! I have no idea what's wrong with this machine. It was working absolutely FINE until my mom put it into hibernate....
Power off and unplug
Press/hold power button for ~15 sec
Open case and remove motherboard battery
Press/hold power button for ~30 sec
Leave unplugged and without battery for couple hours or overnight
Install a fresh CMOS battery (right-side-up!)
Boot with only mouse, monitor and keyboard connected and see what happens now.
Just replacing the battery helped. I don't know why, but afterward, CMOS let me change settings that it wouldn't let me change before I'd replaced the battery. So I changed certain settings, saved, and it booted Windows right up. I immediately change the hibernate setting.... no more hibernate for this computer!!!!!!!