I'll try to keep this as brief as possible.

My parents' computer has been having issues, so I decided to check into it a bit. Most of the time, when I turn it on, the monitor fails to turn on. But when I turn the computer on, then off, then on again, then the monitor turns on just fine. Also, the computer freezes up routinely, for no real reason. The video card is not the problem. Everything else is pretty new, except the monitor, which is pretty old. Could that be causing the problems? Also, would the lack of sufficient power cause these problems? It's a 250w power supply. What could be the cause of these problems? Any help would be appreciated...thanks.