Figure this would be a good post for people who might have this problem. The other day, I turned on my Mac Pro (early 2008) and the power LED kept flashing once per second. I found out this was a RAM issue. I tried the Apple + alt + p + r and it got it working about 3 times then it didn't work at all after. I tried removing the trays one by one to see which had one had bad RAM and it was Transcend RAMS that were causing the issues. I have 3 brands of different memory (samsung, imemory or something... etc) and this was the only one that failed. Just thought people have similar problems or are looking to buy new RAM should consider a second thought before Transcend.