Hi, today I installed 2 more gigs of ram with 800mhz frequency. I have 4 DIMM slots on my motherboard and I was using 2x800 mhz and 1x667mhz ram, but today I installed a new 800 mhz ram with the same CAS Latency as the other 2x800 I have, but my pc didn't boot. I removed the 667 one and it booted, so my question is I could boot my pc before I installed this new 800 but now I cant boot with the 667 installed. How can I solve this or do I have to buy one more 800 mhz?