Well, i've purchased a new PSU and also replaced my mobo.
the 12V is now spot on, however the raid still shows as degraded.
I've set the "failed" hdd to "Fail" and re-activated it but i'm unable to
re-introduce it into the array.
How to i make the array accept the "failed" drive?
Are you able to check the SMART data on that particular drive? Perhaps it is failing physically.