yeah your PSU is a good suspect
I would much rather try an Antec Trio Rail 550 watt unit or the Corsair HX520 watt >>>>> I think the Corsair 520 can be had for a decent price of around $80.00 now!
the best way to add SATA IMHO is a promise brand SATA controller card like this one >>>>> if you motherboad doesnt have sata ports ?
http://www.newegg.com/Product/Produc...82E16816102061