1) Computer unplugged from power, computer on a table, computer case open.
Observe Anti-Static Precautions
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the hardware components inside a computer.
Computer UNPLUGGED from power, computer case open, TOUCH the metal frame of the open computer case to relieve your body of Static, BEFORE reaching inside the computer.
If you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.
2) Remove the Ram Memory module/s. (Module = Stick)
You can lay the computer on it's side for easier access to the ram memory module/s.
Clean the gold plated contact pins on the bottom of the Ram Memory module/s.
Use a pencil eraser.
If you are Not using a solid eraser, and the eraser on the end of a pencil, refrain from letting the metal band touch the contact pins.
The Intel motherboards that use the Intel 845GV chipset use DDR Sdram ram memory,http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg
(You can click on the photo to enlarge. You can enlarge twice)
DDR Sdram ram memory has 184 contact pins. 92 on each side.
Clean each one of the contact pins with the eraser. Both sides of the ram memory module.
Doesn't take long.
Rub the eraser up and down on each contact pin. Doesn't take very much pressure.
After you have cleaned the contact pins it may seem as though you have done nothing at all.
I assure you that you have.
The contact pins do not have to be shiny.
Corrosion develops on the gold plated contact pins, and it doesn't take very much corrosion to make a bad contact.
After you have finished use air to remove the eraser dust.
If a can of compressed air for computers is available, use it.
Otherwise air pressure from your mouth will be sufficient.
(If a can of compressed air is available, also use it to clean out the ram memory slots)
Computer still unplugged from power, press the Power On button in, and hold it in for a count of Five seconds. Let go of the Power On button.
Do this same procedure Two more times.
What you are doing is clearing CMOS Error Codes, and resetting BIOS back to the factory default settings.
Once done reinstall the ram memory module/s.
Close the computer case.
Plug the computer into power.
WAIT 1 minute, then turn the computer on.