I have a IIci that's-for all intents and purposes-dead. When I hit the power button, the power LED will flash on and off and the speaker will "chirp". Looking at the service manual, the solutions for these symptoms are 1. Replace PSU and 2. Replace logic board. I do have a good, working Quadra 700 and the PSU connections look very similar on it. Can I borrow the PSU from it to test the IIci? I don't want to run the risk of also frying the PSU for my Quadra. If the logic board turns out to be the problem, is there any hope for rescuing it? I don't see any obvious signs of cap problems or other issues.