PSU overvoltage?

Hi,

I've bought 2 PSU's from Ebay, one after the other as I cant get them to work on either
of my 2 systems (ASRock Alivedual eSata2 and Gigabyte EP35 DS3R). The Power
does not come on at all.

Using a wire on the green (PS_ON) to GND, it turns on and I measured the voltages.

Be Quiet bqt e5

red 5.12 ok
orange 3.52 not ok (+3.135 VDC to +3.465 VDC)
yellow 12.36 ok
blue -11.66 ok
purp 5.16 ok (+5VSB)
gr 5.13 ok (PWR_ON)

LC 6550

red 5.13 ok
orange 3.37 ok
yellow 12.03 ok
blue -11.85 ok
purp 4.5 not ok (+5VSB)(+4.750 VDC to +5.250 VDC)
gray 5.13 ok (PWR_ON)

You can see that there is a voltage on each slightly out of spec. Would this be enough for the
motherboard to turn off PS_ON to the PSU, or is there another reason. Does the PSU need to be grounded
via the case, as I have the PSU next to it on the floor? Maybe something else I missed?

thanks,
Jon

- I am now aware second hand PSUs on Ebay is not a great idea.