Just installed new RAM but BIOS isn't loading

[Roger5667]

I just bought Corsair CMX8GBX3M2A1333C9 XMS3 8GB for my ASUS P7P55D-E mobo but when i boot up there are no beeps and the DRAM_LED flashes red for 10-15 seconds or so and then stays solid. I also just put my old RAM back in and my mobo is only detecting 1 stick. Any ideas on how to fix this? Thanks.

 

[C12Friedman]

Welcome to Tom's Hardware Forums,
With that Asus board, it is very easy to insert the ram but not quite fully... try pushing down firmly on the non-locking side of the ram -see if it'll lock down further. Also, check all your connections (especially power) to ensure one wasn't knocked loose
Hope it helps