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Make doubly sure all cables and wires are connected correctly and firmly inside the computer, then see if it will boot into Safe Mode.
To boot into Safe Mode, begin repeatedly pressing and releasing the F8 key (top row of keys on the keyboard) as soon as the computer starts up. If it beeps at you every time you press the F8 key, that means it registered the key press so you can stop pressing it.
That will get you to the boot menu where you can choose Safe Mode.
If it will boot, and run correctly, in Safe Mode, the cause is probably not hardware.
Did you install any new software or hardware right before the problem began? If so, that's the first thing to suspect of causing trouble.
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