Hello, my boyfriend and I both have windows 7, he has home premium and I have professional and we are trying to upgrade our ram from 4 gigs's to 6 (and beyond), but windows wont start up if we try to put in more than 4 gigs of ram. Onder bios both our motherboards can see the ram just fine but windows wont start. Here's what my computer is running on Motherboard ASRock M3A785GMH/128M AM3 AMD 785G HDMI Micro ATX AMD Motherboard Processor AMD Phenom II X4 965 Black Edition Deneb 3.4GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor RAM (2 of these for a total of 4 gigs - so far)Crucial Ballistix Tracer 2GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model BL25664TG1608 (We both have 1tb hard drives as our main drives and other smalerl hard drives (sorry I forget the models) My boyfriends system is exactly the same except his motherboard is a slighlty different asrock model but almost identical to mine (I opted for a few less slots). Both of our motherboards are capable of using up to 16gigs of ram and our operating systems should support more ram. Home Premium should take up to 16 and my profesional should be even more. Does anyone know how i can fix this and get windows 7 to let us use more ram?