ASRock H77M BIOS POST Delay

[Benevolent Deity]

Hello,
I have an ASRock H77M motherboard that has worked perfectly for the last two years. Now, all of a sudden when I start the machine cold the BIOS POST pauses for exactly 5 minutes after the first two lines of display (the BIOS date) and then continues on and works perfectly. This delay does not occur if the machine has been on for an hour or more but does occur when it's cold. I've replaced the battery and reset the CMOS to no avail. I've tried to update the BIOS (currently at P1.20) but so far I haven't been able to get any of ASRock's recommended update procedures to work. Any ideas?
Thanks,
Ray

 

[MasterDell]

What memory are you using and how many sticks?

 

[Benevolent Deity]

What memory are you using and how many sticks?

I am using 2 sticks (2x4GB) of Corsair Vengance DDR3 1600MHz memory, an Intel Core i3-3220 3.3GHz CPU, a Crucial CT256M4SSD2 SSD primary SATA drive, a Western Digital WD5000AAKS secondary SATA drive, a Seagate FreeAgentDesktop 500GB USB drive, and a Microsoft Wireless mouse.

 

[MasterDell]

Sounds weird but unplug all USB devices then power on.