I have a DC 7700 SFF that had 4 warning beeps with the red LED flashing simoutaneously. I swapped the PSU with a new one, then got 2 warning beeps. PC won't stay powered on. The fans(all) begin to spin, but then stop. After reseating the CPU and heatsink, the beeps went back to 4. HP is to send me a new heatsink, but I'm doubtful that'll make any difference. :confused: