Gigabyte z77xud5h problems

[spera]

Hi, i have a gigabyte z77xud5h with f14bios
my problems are:
sometimes when I start my computer (1 time a week or less) the computer stays on the logo screen and the debug LED shows a2, restart and turn smoothly, because happen?

and the last thing sometimes when I turn off the pc (I happened 2 times in 3 months) does not turn off the computer and displays 05 ..

I also happened once in three months (suspended computer and started flashing logitech g15 keys and unresponsive computer to return it to normal, I had to do clrmos)

thank's all


pc specifications

i5 3570k
8gb Corsair 1600 CL8 1.5v
Zx 850w Ocz gold
Radeon hd 4870
128gb crucial m4
seagate 500gb

sorry for my English I'm Spanish

[ex58]

Any spare PSU to try?

OCZ is well known as not good for GB boards.

[spera]

Any spare PSU to try?

OCZ is well known as not good for GB boards.

I have a gigabyte superb 720, but it was a scam has only 610w, and I buy this ocz gold and it cost me a kidney, I think it's´not  because of the source, as my previous was a  motherboard ga-790xUD3P and there was no  dramas, also only happens once in a great while

[ex58]

I using gigabyte superb 720 for 2 my GB Z77 boards,no problem at all,since you have 1 Video card only.

[spera]

I using gigabyte superb 720 for 2 my GB Z77 boards,no problem at all,since you have 1 Video card only.

at any rate, the superb 720 cant be compared with tha ocz i buy it because it was better,I think it is not the power supply, took a week for now without problems, but it happens when she wants