I've just built a new computer, but it's not booting. When I press the power button, the BIOS continually beeps in 3's I checked the Intel site and said that's a memory error, so I bought some new memory, but it's giving me the same thing. Anyone know what this means or what I should do?

Using a Intel DP55WB Motherboard with intel Core i5 750 processor. Tried it first with OCZ platinum 4GB, then corsair xms3 4GB.