windows xp

Are you trying to ask how to get it started?

Replace the part that broke.

If your next question is what part broke:

You tell us, we aren't there and you gave us no information.

If you don't know how to test for what part broke:

Take the computer to someone who does.

If you want advice:

Buy a new computer, it can end up being cheaper than trying to fix your 6-year old computer.

is there a way to get it started ? the monitor stays on a few seconds and no signal and goes off before i can do anything with the keyboard .

A new computer will not only be cheaper than trying to fix your six year old one, but it'll have a whole lot more bells and whistles - and more memory.

Yes.

But across the internet I can only guess what it could be and even if I guessed right you may not be able to do anything about it. Are you capable of doing things like taking it apart and testing it piece by piece (in another computer for example)? If not, there's nothing we can do to help you and you need to take it to someone local who can actually investigate and fix the problem.