This appears to be the dreaded 'Cold Boot' problem.
Very hard to diagnose, usual suspects are RAM, motherboard, PSU, CPU.
Can you download CPUZ
and post a snip of the CPU, Mainboard, Memory, and SPD tabs.
For posting the information , enter 'Snipping tool' in the Start button > Search box, hit enter. Select the area you want to post and save to a convenient place. How to Post a Screenshot in Seven Forums
Have you been checking your temperatures? Use Real Temp
, to check the CPU temps when at idle, under load and/or testing.
Let us know the minimum and maximum temps you get.
Go to your BIOS and tell us what the CPU, RAM and the NB (North Bridge) voltages are.
This is important in order to make RAM settings adjustments.