IF you feel comfortable enough to go inside the computer go for it. Its not difficult and you won't do much damage if your careful. First unplug the pc from the wall, also unplug everything from the back of the computer. I believe there are two thumb screws that secure the side panel of the case remove theses and slide the panel towards the back of the computer to remove it. Before touching anything inside the case touch the outside of the computer case. This will ground you to the computer and prevent you from giving the computer a static shock do this every time you stop touching the computer and go back into it again. Once your inside look for any substantial dust build up and any loose cables that. If there is allot of dust inside get a can of compressed air from your local office supply store or Walmart etc.. Blow the dust out and make sure to clean the fans as well. Next look for the memory. it will look like this
On either side of the memory are locks that need to be pressed to remove the memory remove both sticks of memory if you have 2 and re-insert them back into the slots firmly and make sure they are seated completely into the slots and the locks are properly closed. After you have reseated the memory and cleaned out the dust replace the side cover and plug back in the keyboard, mouse, monitor and power cables and see if the computer will start.
If it still wont start you can then test the power supply its located near the top of the computer its where the power cord plugs into it looks something like this
You can purchase a PSU tester from newegg.com
the 24.99 model should work ok. The cheaper model would suffice but it does not show you what the exact voltage out put of the power supply is only that it is turning on properly.
Edited by Sneakycyber, 08 May 2010 - 08:21 AM.