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I did not check at the time because I unplugged the system as soon as I could to avoid permanent damage.

Interesting. That doesn't match my symptoms though, because all my motherboard capacitors have been replaced and are good. Any other ideas? Do I need to swap out those yellow rectangular capacitors on the power supply?

Picked up an old IIci from my local junkyard and cleaned it up, recapped the motherboard, and cleaned up a bunch of corrosion from the leaked capacitors with my ultrasonic cleaner. I was able to boot it after that, and it ran for a while. However, I then had issues booting the machine. Messed...

None of the traces looked that bad to me; is it possible a component may be damaged? Such as a triac?

I have recapped a Macintosh Portable for someone, but when I try to boot it, the screen looks as follows: What might be malfunctioning? The computer had rust damage on the inside and I ultrasonically cleaned the board, but it still does this. Any idea of what components I should look at on...

Upgraded my Performa 640CD from 16 Mb of Mac RAM to 52 Mb of Mac ram. The ram for the Dos portion was 32 Mb before and after the upgrade. After upgrading, the Macintosh System 7.5.1 portion seems to run without issue, but when I try to boot into the DOS portion, I get a blank screen. The DOS...

So I took it apart again, and swapped the IDE cable with the one from the other iMac, and everything worked. So I'm not sure if the IDE cable is specific to that drive, or if I was just dealing with a bad IDE cable in the first place.

Picked up the top of the line 1.25 GHz iMac G4 from the junkyard, and everything on it was working except for the CD/DVD drive. When I pressed the eject button on the keyboard, nothing happened. In addition, I went to the command line mode on bootup (CMD+OPTION+O+F) and then typed in "eject cd"...

Thanks for the tip! I pushed on the connector a bit and then turned the computer back on and the screen comes on properly now. Unfortunately the floppy seems to be broken so I'll be looking into that next...

Found a Macintosh Plus for a really nice deal in my town; however, when I turn it on, all I see is a tiny white dot exactly in the center of the screen. Has anybody had this issue before? What is it possibly caused by, and how can I fix it?

Pretty sure I booted one with no keyboard attached once. I think these things might be really temperamental and decide to stop booting now and again. I had one that worked for a while but today I plugged her in and NOTHING!!! I think I might have to throw all these in the dump if I can't figure...

Thanks for the links, but I've already tried resetting the PMU and replacing the battery with a fresh one. It's the first step I take whenever I try and boot an old Mac. It has done nothing for these old machines. Any other ideas?

Thanks for the suggestion. Most of the components are soldered on. Would you suggest first replacing the surface mount capacitors on the mainboard or the through hole capacitors on the power supply? None of the power supply capacitors have any visible bulge or leakage. In addition, the surface...

Yes. They all do have RAM installed.

Thanks for the advice. I have replaced the battery with a fresh one, but the machine still stays dead. Any other ideas? 

Totally dead. The fan doesn't move at all and the computer does not make any noise. Monitor doesn't even click on.

Thanks for the reply. All components are installed. I should have specified, these are not stripped down. Kind of wondering which components may have failed which are causing them not to start.

Picked up a load of Model A1002 eMacs from the local junkyard. A couple of them are in very nice condition, but they do not boot at all. I opened them up, took a few boards out, and can't find any popped capacitors. Has anybody brought these back to life before? It would be interesting to know...

Picked up an old, very dusty Macintosh 7100/66 from a guy in Cincinnati about a year or so ago. Worked for a while but one day I heard some crackling noises coming from within the PSU. Unplugged it very quickly and cracked open the PSU to find the devastating scene in the attached photo. I...

Just got my GGLABS RAMGS/4 in the mail, installed it, turned on DMA, and everything runs as it should! Thanks for all the advice from everyone. I'm happy to have learned something new.