I have a T620 which originally had two L1100E-S0 (LiteOn) PSUs, both PN: GYH9V. When one of these failed, I ran it on just the other one, until that also failed. Neither light green when plugged in.

I bought replacement PSUs (refurbished) which are E1100E-S0 (Emerson/Artesyn), PN: GDPF3 & YT39Y. Based on information from the seller, information on Dell driver firmware and information on posts in this community, I believe the new PSUs are compatible with the T620.

The new PSUs light green when power is connected, but the server does nothing when the power button is pressed. The fans don't even start. The only sign of power within the server is a green light (LED10) on the MOBO.

The PSUs have some physical differences, the most notable of which is that the connectors on the large tab span different numbers of pins, as shown in the photo below. The new PSUs (left and centre) have 2 connectors on the top (and 3 on the bottom) whereas the original has 5 on the top (and 5 on the bottom). Should I be concerned about this, given all the online info states they are compatible?

If the new PSUs are working properly and are compatible with the T620, then there must be something else at fault. I don't have the luxury of having spares I can swap in to test for the problem. Does anyone know what is likely to be damaged by a PSU failure, or what steps I can take to test what the problem part is without having replacements?

Thanks in advance, Ian