I have a slightly refurbished Dell L433c (new HDD, sound card, memory) running
XP. It starts and shuts down normally several times, but will inexplicably refuse to start at other times. The power switch glows, but there is no fan noise, no hard drive noise, and no beep codes. I shut off the switch and pulled the power cord from the UPS and plugged into the wall and the box switched on fine. I tried to get the machine to repeat the problem with no luck. After many startup/shutdowns, I pulled the power cord from the wall and reinserted it into the UPS. This resulted in a startup without depressing the case switch. I again tried to get the problem to repeat with no success. It happens when it wants to. If anyone has some insight , ayudame, por favor.