Tried to upgrade memory now computer wont stay on

I tried to upgrade from 4GB to 8GB of ram. After installing the 8GB of ram, the computer would boot but then hang at the windows loading graphic. I tried re-seating the ram and ended up with the same result. I then tried switching back to my original 4GB of ram and was met with a flash of a blue screen right after windows loaded. I tried checking the bios and everything appeared fine. I then read that flashing the bios with a update and trying the new ram might work. I tried and ended up with the same system hang. I then went back to the old ram and got the blue screen again. I decided to try re-installing windows 7 64 bit. I was able to get back into windows and start installing drivers. After about 10 minutes the computer shut off and started shutting on and turning off every 5 seconds until finally I cut power to the power supply. I'm at a loss of what to do. Did I fry something on my motherboard? Did the ram fail? I don't have another computer right now so downloading memtest to run isn't really an option.

Specs of the computer:
Motherboard: GIGABYTE GA-H55M-USB3 LGA 1156 Intel H55

CPU: Core i3-530

ORIG RAM: CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX4GX3M2A1600C7

UPGRADE RAM:Corsair Vengeance 8 GB ( 2 x 4 GB ) DDR3 1600 MHz (PC3 12800) 240-Pin DDR3 Memory CMZ8GX3M2A1600C9

GPU: Nvidia GTX 460

PSU: OCZ 500w 80 plus certified
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More about upgrade memory computer wont stay
  1. did you put the old ram in then try and clear the cmos to see if the mb did not set the ram speed up right. (in the bios is the mb set to standard speed and xmp profile on?? and sata ports set to achi mode??
  2. Yeah I tried resetting the BIOS but maybe I didn't do it properly. I'll give it a try once I get home from work. Yeah I tried setting the XMP on and off and the speed to all 3 settings. Nothing seems to be working. I can't seem to get my computer to stay on for longer than 10 minutes when I do.
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