I have a short stack of boards that I put aside for a rainy day (or a brainstorm). These all have some degree of +5/GND shorts. I have removed the socketed parts and verified that the problem isn't in the PS section. Also checked other easy things like solder-side bent pins, etc. So, are there any easy, common problems with these? I have repaired many other types of boards, and just don't see this happen on other platforms. Maybe with the onboard PS, when it dies harshly, it shorts a TTL badly or something. I know that with a good DMM, you should be able to better pinpoint the problem area by checking resistance, etc. Randy Fromm has written articles of using an external +5 source to find a shorted node, but I am not sure if that applies here. Ideas?

So, to be clear of the situation on these boards, they all show a bad +5, although the PS section seems good. Resistance between +5 and GND is less than 70 Ohms, where on my DMM, the value is usually 180 or so.