HP Proliant DL380 hot-swap drives don't work in all slots

[CA1243568]

I have a very weired problem. I use two mirrored 36Gb drives in slots 2 and 3, and they work fine. When I move them to slots 0 and 1 only drive on slot 0 works, another one shows faied. When I tried to populate all 4 slots with identical drives, server refused to boot saying no valid boot device. Is it a controller issue, does anyone had similar problems? Any help would be much appreciated, this thing drives me crazy.
Thanks,
Stan.

[CA859951]

Stan:

It sounds as if the SCSI backplane board on the drive cage is bad. (which is why you have boot drives starting in bay 2)

What generation DL380 is this?

[CA1243568]

No, actually I already replaced backplane, thinking it could cause this problem. In fact, I was able to regain slot 0, and only slot 1 is acting weirdly now. I have a reason to believe it has something to do with clusters. Slot 1 behaves like it is a quorum drive, however it is only my assumption. Couldn't find any info about this issue. Thanks for your reply.

Stan.