I've acquired a non-working Mac Performa 476. Unfortunately, I don't have any other Mac gear to help me with the diagnosis. I've the Performa 476 itself, which may or may not be working; I've got two Macintosh Color Displays (M1212) which may or may not be working, and one spare Performa 475 motherboard purchased from eBay. It was advertised as pulled from a working system--but I've no way to verify this. The seller was a reputable one, so I'm inclined to believe it's a good board. The 475 motherboard is identical to that of the 475. The difference between the two models being that the 476 shipped with a larger internal HD. When I power up the system, with monitor attached, the internal cooling fan spins up, the hard drive spins up (and sounds normal), and the machine chimes what I seem to recall as being the regular start up sound for this era of Mac. However, the display remains dark. If I power off the Mac, leaving the monitor on, the monitor makes a light static/crackle noise; it's the sort of sound I normally associate with a monitor that's lost the video input signal. I've played with the brightness and contrast controls without any success. If I switch the other monitor, the behavior is the same. If I switch behavior is the same. It's possible both monitors are bad and/or both motherboards are bad. I don't have a multimeter to verify that the voltages coming out of the PS are correct. Nor do I know that the hard drive is functional--but I'd assume that nothing needs to be loaded from the HD in order to get the display to come up. I'm a bit puzzled, and wondering if anyone here with insight on these Macs and their displays can give me any additional pointers. -brian.