I have pentium 4 Dell computer with widows 2000 operating system. I got a problem with my PC after I have done the following. I have bought an apparatus called Champion which is used for unlocking and repairing cellphones. I installed all softwares associated with the aparatus and I connected the apparatus to the parallel port (LPT1) of my PC. But I made a mistake when I gave power to the aparatus. I gave high voltage AC and it got burnt. (Short circuit is created and it became out of function). At the same time My PC became stuck. I restarted it but it couldn't start. I have measured the output of the power supply of the PC. the meter read nothing. I changed the fuse and when I measured it, it became ok. (12v and 5v dc), But still it couldn't start. what shall I do to correct the problem for my PC please?