Okay so... Bought a 2009 Mac Pro about a month ago, Worked great, did the 5,1 firmware flash, worked great. Bought ram, CPUs, and a GPU to upgrade. Started with the CPUs X5690's, delidded them myself, pretty sure I killed one of the CPUs. was getting both CPU led lights. So anyways I tried putting the old CPUs back in just to get it back to a running state, and now when I boot up, I get no chime, no display, and the LED next to the power button blinks about twice every second (no other error LEDs. I've read all over online and I keep reading that it's not detecting my RAM, or my RAM is bad. But I had 6 sticks that worked previously to the CPU switch. I tried each one individually in DIMM slot 1, as well as the new ram sticks just to check, and on change. I've done a lot of troubleshooting but I'm no expert. Hoping ya'll could give me some advice. I could really use some help, before giving up and dropping a ton on a new A board w/ CPUs and all. Thanks!