|- Please post the model/model number of the Dell.|
- The PSU probably isn't the problem but post the wattage of the original & the make/model & wattage of the replacement.
- Power buttons generally don't go bad.
- the motherboard battery definitely isn't the problem but swapping it out reset the BIOS. You'll have to deal with that issue later IF you get the system to boot.
- the POST test card is useless & was a waste of money.
I suggest you take DAVEINCAPS advice & disconnect everything that's "non-essential" - unplug all the drives (HDD, optical, etc), remove all internal cards, unplug ALL external devices & connections (mouse, printer, speakers, internet, etc) except for the monitor & keyboard. If the monitor is connected to a video card but the motherboard has a graphics port, connect the monitor to the board's port. And if there's several sticks of RAM, remove all but one. Once you've done all that, try powering up the system. If you get the Dell splash screen, something you disconnected is the culprit. If it still doesn't boot, remove the last stick of RAM & try again. Without the RAM in place, the board should beep like crazy. If there's no beeps, either the board or CPU is bad.
message edited by riider