Dell Inspiron 560 PSU Upgrade

Diablotek is known for making bad PSU and are not reliable i would suggest buying a new PSU any of these ones would do the trick PSU:SeaSonic S12II 430B 430W ATX12V V2.3/EPS12V 80 PLUS BRONZE Certified Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151074#top

PSU:Corsair CMPSU-430CXV2 Builder Series™ CX430 Power Supply - 430W, 80 Plus, 120mm Fan, Single +12V Rail, Active PFC
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=422169&Sku=C13-2810

PSU:XFX P1-450S-X2B9 Core Edition Power Supply - 450W, 80 Plus Bronze, Active PFC, 120mm Fan
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1143934&CatId=5430

PSU:Rosewill Green Series RG430-S12 430W Continuous @40°C, 80 PLUS Certified, Single 12V Rail, Active PFC "Compatible with Core i7,i5" Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182202#top