Just MOVED and pluged my p4 desktop back up and now it wont power up.  I get a led on MOTHERBOARD.  Replaced power supply but same problem.  tried swapping power switch w/ reset, no diff.

Any suggestions would be great.Does anything happen at all? Any sounds or anthing?

What exactly happened before this problem?No, it doesnt make any sounds, no activity at all when I trying to turning it on.  I boxed the computer back up into original box and packing, moved 600 miles, it sat in storage for 4 weeks.  I then unboxed and hooked it back up...nothing.  1 led is lit up and the cpu fan did a half turn when I cycled the power supply switch off/on on the old power supply.  But i replaced the power supply same problem.Is the voltage right on the PSU? (there should be a switch somewhere with 120v and 220v)Remove and re-seat all SLOTTED components including RAM; vid cards; SOUND cards; modems etc...
As always when working inside the case remove all power sources and take anti static precautions.