It appears that you took the PSU voltages while the PSU was disconnected from everything else? If so, I strongly suggest you put it all back together and take voltages from the floppy connector on the back, using a paperclip, as one of my previous posts in this thread directs. You can then get a truer picture of whether your PSU is driving the system at 5v and 12v. If you are only getting 4.5v or 10v while the system is all connected (i.e., the PSU is loaded), then you need to adjust the voltage in the upward direction.

If your computer is acting flakey when you connect and disconnect and connect, then it is likely your connectors are suspect. It could be a broken set of solder joints. You have to look closely to tell for sure.