Alrighty, Let's open that puppy up.
Unplug the compter
After it's unplugged push the om button & hold it a couple of seconds
Remove the side cover
The first thing to check is if you have onboard video or a video card.
Does the monitor cable attach to a "add-in" card ?
[One that is installed in a slot on the lower part of the motherboard]
If it does make sure the card is fully seated
[press down on eith end a little]
Look around on the motherboard
You should see a battery about the size of a quarter.
[looks like a oversize watch battery]
You need to remove the battery & wait a couple of minutes then put it back on
Try the computer & see if you get anything .
........................
"Five year plans and new deals, wrapped in golden chains.
And I wonder, still I wonder who'll stop the rain."