|#1 thing you need to learn is this. When ever you do any kind of work on any electrical product the first thing you do is remove the plug and better still put a lockout device on it. You must protect yourself and the equipment from all energy. Energy could be springs, heat, electricity, hydraulic or what not.|
In the very start of any home computer a small test is performed. That test must pass a test of the memory before any monitor can be displayed.
But, since you now might be suggesting some other issue.
Please report exactly all signs that the computer does when you power it up.
Do you see keyboard lights blink, fans start, drive lights? Tell it all.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.