@mahamedapdi you are really not giving us anything to work with here. We need to know what it is that you are trying to do. To boot it, you will need to turn it and then your hard drive should kick on and start the process of booting your OS. Of course, first steps would be your BIOS etc. It'll be a lot easier if you tell us what the issues are with your computer.
If nothing else, here is the [document|33168] for your computer. It should have all the information you need to fix it.