When you pulled the plug to shut it off, you probably just corrupted the Power Management Unit. It is a small computer within the Power Mac 7500 that controls power flow throughout the logic board. One thing you could try is pulling the battery out of its socket (green and purple colored), put it back in again and press the reset button (located on the logic board near the processor card) for about a second. This will reset the PMU enough to get it powered back up. If not, go on to the next paragraph.

Start by unplugging your 7500 from the wall. Then open the case up. Next, remove ALL PCI cards that are installed. Then remove ALL of the RAM. Next, remove ALL of the VRAM cards, if installed. Plug the 7500 back into the wall and press the power button. You'll hear the sound of breaking glass shattering coming from the internal speaker. This is supposed to happen. After you hear the sound, turn the machine off and place ALL cards back in their proper place. The 7500 should now be back in working order.

What you've done in the above paragraph is about the same as giving a person a shock from a defibrillator. You shocked the Mac's heart back into normal rhythm. Take my word for this: I've used this many times on mine and it just works.

Give it a try and let me know how it works.

73s de Phreakout. :rambo: