Ive never seen ram fry a psu,but i guess its possible.
Chances are if the psu has blown it may have taken the mobo with it.
Ive learnt the best way to test this out is to use a psu tester or borrow another working psu.
PSU tester click here these can be found cheaper via Google.
One way around the OEM issues,and this topic gets very debatable.
If you replace the mobo like for like and use the current HDD, a simple call to Microsoft maybe needed to reactivate windows. Some say you cannot do this...you can,ive done this on a couple of occasions when the mobo has blown due to power surges and a lightening strike.
When buying a new mobo if indeed needed,i would go for the mobo bundle,guaranteed to work with compatible ram.