My motherboard has 4 slots for memory. First 2 slots are black and next 2 are blue. The computer was working fine up until a couple weeks ago. It started only posting intermittently then not at all. I eventually found that if I remove RAM from the blue slots it boots right up. It will not post when there is any amount/combination of RAM in the blue slots - only if 1 or 2 sticks are in the black slots.
Also, if NO RAM is installed at all, it won't post and I get no beeps, etc...
I've replaced the motherboard, PSU and CPU.
My question is why would RAM cause a PC not to post? All 3 sticks of RAM can't be bad at once, so why would 2 slots stop working and still not work on a new Mobo?
I should not I have since switched back to the original PSU, which tests good on my PSU tester. Also, replacement motherboard was used.
Again may just have been a bad mobo, but it's very symptomatic of possibly bent/broken pins on the CPU also, see a lot of DRAM slot failures from that, wish AMD would change the CPU design to have the pins in the socket and go with touch rather than the plug in they still use