Ram only works in 1 slot

Hi, Have you checked the CPU for bent pins? It might be a memory controller issue.

Hi, thanks for the quick reply.
The cpu has no bent pins and is brand new along with the motherboard.

I know all three of the ram slots can't be broken.
both of the blue slots dont work and the one black slot also does not work

I would check though the CPU using a magnifying glass.

I looked again, everything seems in order.

Then I would RMA both motherboard and CPU.

i cant rma motherboard and i switched out the cpu same problems

Help

Does anybody know how to fix this issue?

I found the tech specs on your motherboard ....
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en...

make sure all your ram you're trying to use matches the requirements....
Dual channel memory architecture
Four 240-pin DDR2 DIMM sockets
Supports PC-4200 (533 MHz), PC2-5300 (667 MHz), and PC-6400 (800 MHz) DDR2 DIMMs
Non-ECC memory only, unbuffered
supports 2GB DDR2 DIMMs
Supports up to 8 GB on 64 bit PCs
Supports up to 4 GB* on 32 bit PCs