Need to establish what the problem is.
Is it the PSU? - often they bite the dust. If the computer doesn't even turn on I suspect this would be the problem.
If the computer does turn on but doesn't get to the BIOS boot screen then it could be the memory. Try taking it out and reseating it.
If its just hanging with a flashing cursor or seomthing similar and not loading the OS.. its likely to be the hard drive - they wear out, I've been through several over the years.
Is it the PSU? - often they bite the dust. If the computer doesn't even turn on I suspect this would be the problem.
If the computer does turn on but doesn't get to the BIOS boot screen then it could be the memory. Try taking it out and reseating it.
If its just hanging with a flashing cursor or seomthing similar and not loading the OS.. its likely to be the hard drive - they wear out, I've been through several over the years.