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"I would unplug all the peripherals (hard drive, floppy, etc). Leave the memory in. Power it up and try to see if you can get to the BIOS setup screen (usually) by hitting DEL.

And remember it might be your lcd/monitor."

I've tried unplugging the peripherals. I haven't tried hitting DEL in an effort to get hte BIOS setup screen.

The monitor does work - I get the monitor's built in setup screen when I power up.

Thanks for responding - any other ideas?

If you can't get to the bios setup screen, you might be toast.

Check the board to see if there is a jumper to reset the bios. If not, WITH THE MAIN POWER CORD DISCONNECTED, try to find the battery that keeps the bios charged. Remove it. Short out the leads that go to the battery, this will totally power down your bios. reinstall the battery that keeps the bios alive, reattach the real wall power, then try to boot.

If that don't work, hire a pro. I get $92.00 an hour

djf's point is spot-on. Start with as little as possible. You've replaced a lot of stuff. It is very, very possible that, in trying the fix the original problem you've inadvertently created others. This is not your fault, but is a result of the overall poor hardware quality that characterizes modern PC components.

When I was in this situation most recently it had to do with the seating of the memory SIMMS (or DIMMS, or whatever they're calling them nowadays). Screen would not come on, nothing. Maybe even the clicking, don't remember. What you do is make certain they are making contact and are firmly seated in the sockets. Possibly clean them with a 91% alcohol-dabbed Q-Tip (wait a few minutes for alcohol to evaporate if you do this.). Ensure the notch on the bottom edge matches up with the little hump in the socket seating.

A quick note on processors, fwiw: replacing the processor is a pain, as today's processors are so electrically inefficient you could practically heat a small room with them; make DARNED SURE you've got that heatsink fully contacting the CPU, and preferably with a dab of silicon grease between them. One split second without a heatsink is sufficient to fry it.

This is just from my experience. I defer to the experts of course, but want to emphasize djf's point: minimize the potential points of failure and take baby steps.

I haven't tried hitting DEL in an effort to get hte BIOS setup screen.

This is the one thing you should do to verify the hard drive's status. Once into the BIOS you can check to see if the BIOS will do an auto detect of the hard drive. It should be in Standard CMOS or andvanced chipset areas.

If the HDD is bad the BIOS will not be able to detect it.