I have an HP Pavilion that's been having trouble starting up. Once it starts it works just fine. I haven't changed anything inside lately and I'm running Win98. I'll turn the computer on and the lights will flash but nothing else will happen for approx 5 minutes or more. The monitor will show No Signal Input. After a bit of time I'll hear a loud thumping noise coming from the speakers and then everything starts just fine. As I said before, once it starts I have no more trouble - everything works fine. Does anyone have any ideas what might be causing this? I'm guessing something is going bad, but what? Thanks for any suggestions.