My computer: 3 year old HP with Windows XP.

Here's my situation: Yesterday, I needed to move my computer from one room to the next. It was working just fine before I shut it all down and disconnected everything. I set everything up in the new room and connected everything properly (I think). The last thing I did was plug the computer into it's power cord. When I did that, there's a little green light on the back of the computer that seems to be connected to the power supply within the computer. It was blinking. The little blue LED behind the power button on the front of the computer was blinking in unison with this green light. I tried to turn the computer on by pushing this power botton as I would usually do, but nothing happens. Does this sound like something shorted in the power supply and it needs to be replaced, or what? I'm almost ready to chuck it out the window and buy a new computer. (I will if the power supply costs half of what a new computer will cost). Can anyone advise? Thanks!I don't think it's a power supply, just yet, but they are only about $30. I don't think you can get a new computer for $60? If you've had it on the floor for 3 years, it could just be CHOKED with dust bunnies.It HAS been on the floor for a while. I opened it up and it IS pretty dusty inside. I'll need to blow it out, I GUESS. Not sure I would trust myself to replace the power supply, but I can try it. Thanks for the reply, though. Maybe I'm just looking for an excuse to by a new computer.I'm not saying it's the power supply, just yet, because you said some of the lights came on. The PSU (Power Supply Unit) puts out a number of different voltages, some of which turn on when you plug it in and do not press the power button. Some computers protect themselves from turning on if the CPU fan won't spin or is disconnected. Maybe when you moved it, something came loose inside.That could be a possibility. I thought I was careful with it when I moved it yesterday, though. I guess I just thought since it was working just fine when I shut it all down yesterday, that it's just weird that it won't start up when I hooked it back up. You wouldn't happen to know abouts what it would cost to take it to BEST Buy and have them replace the power supply or something, would you? Would you suggest I simply get some COMPRESSED air and do a nice blow out of it first and then try plugging it back in and see if it starts up?Costs about the same as taking your car in for repair. Hourly rates are the same.