Ok!! so I changed my Power supply unit (PSU) when it died. Got a new one installed but when I switched it on, a long continous beep came on immediately.
Mobo is a SuperMicro X5DAE. The old PSU was an Ablecom SP450-RP...the new one is an Antec True 550.
I've tried taking out the RAMs, video cards, sound cards, etc...but still the same noise.
Any help would be greatly appreciated.