RAM details as follow:
KINGSTON 1333MHz 4GB DDR3 SODIMM Retail Pack KTA-MB1333/4GFR
Product Features
Includes one 4GB module of 1333MHz DDR3 Desktop memory for select iMac's
Works with imac intel core i3/i5 21.5 inch and i5/i7 27 inch
Memory designed, manufactured and tested to the specifications of each particular brand name computer system
From the industry leader in PC memory
204-pin SODIMM type
Technical Details
Model: KTA-MB1333/4G
Item Package Quantity: 1
Hardware Platform: Mac
Memory Storage Capacity: 4096 MB
Memory Speed: 1333 MHz
Warranty: Lifetime
i had try to reseat the RAM and the same thing still happen. my silly question.. 😝 how to check the bad RAM..?