My new rig has a slight hiccup. When I power on the PC will POST 3 times before actually starting up. Playing around with ASUS EFI BIOS I tried different "auto-tuned" overclock settings and at one point it would only post twice before start up. Another setting would post 3 times and then display the "Overclock Failed" message.
I had everything in BIOS set to AUTO, except for the manually inserted timings as per manufacturer spec. I then used the ASUS AI Suite to "Auto-Tune" my system to "Fast". It restarted and booted up just fine! But then, I shut down, came back an hour later and then it did, and continues to post multiple times before startup.
My mobo shows a code of 19 after the first post, which is related to "Pre Memory PCH Initialization". It then restarts, tries to post again, and then once more before restarting.
I have read a few articles on similar issues. I have updated the BIOS to the latest version. I have "Power On by PCI-E" Enabled. I have a sneaking suspicion I am missing some slight setting in regards to my memory, but if anyone want to take a crack at this issue, I would be most appreciative.
See posts 16 and 18 and any follow up discussion you want. I haven't tried this yet because I haven't felt like cracking into my jumpers, but others say its helped with the pre-post reboot issue you described.
I've heard RAM timings can be the culprit, but my board auto detects the proper timings and voltages and I still have this issue. Good luck.