Switching power supply fry

[List, Christopher]

Hi guys - 

I have a question regarding a switching power supply that came from an
external CD rom drive. As I was planning on using this inside my Akai
S3000XL to power an internal SCSI drive, this is on topic :).

While testing the setup, I accidently fired up the PS with the drive
attached, and the AC connections, - but not the ground :o

The PS died, but the drive and the sampler are OK. The PS has no power
at the +5v output and about 8v at the 12v output. I understand switching
supplies up to the FWR and the caps after it. The rest I haven't figured
out yet...
To speed the repair process I present this question; for a basic
switching supply like this (it is basic) what's the most likely thing to
have blown under these circumstances?

- Thanks,
CList