I believe you may be correct regarding the psu problem. It used to work fine with all components installed. Last night, this issue occurred with none of the external tuners installed.

Do you happen to know what current can be drawn from each rail? I have a a few components running in there.
3.5" WD Green HDD, Slim line DVD-Rom, 8cm cooling fan.
As I said, it used to all run.
Is there a better psu than the original clone psu?

Regards.