GA-Z77H-UP5 TH stops at A6 LED error code

[nickweavers]

I rebulit my PC about 8 months ago using a GA-Z77H-UP5 TH (revision 1) motherboard with BIOS version F11.
For cooling I used the Zalman CNPS20LQ. Everything worked fine  and I enjoyed months of gaming through my Nvidia GTX 690.
Temps in the system were always normal to medium - never got that hot.
Then I went to work abroad for 3 months and when I returned and fired up the system, I noticed it getting sluggish and got some BSOD's so I checked the temps and found CPU up at 100c. Also, the CPU cooler pump seemed to be making some noises it hadn't been making before. I started to suspect maybe it had got some air in and wasn't circulating properly.
I decided to swith the pump for a Corsair H80i but after reassembling the system (no other parts changed) it now stops at LED code A6 during power up.

The sequence is that it goes through A2 (Detect and install all currently connected IDE devices), then to A9 (BIOS Setup is started), then to A6 (Detect and install all currently connected SCSI devices).

I don't have any SCSI devices attached.

Can anyone advise on what I might look for as a possible cause?

TIA,
Nick
 

[nickweavers]

Sorry, I should have posted my full config:

Mobo:  Gigabyte Z77X-UP5 TH
CPU: Ivy Bridge i7-3770K CPU
Cooler: Corsair H80i
GPU:  Nvidia GTX 690
PSU:  Corsair AX850 Professional Series 850W AX ATX/EPS 80 PLUS Gold
RAM:  Corsair CMP32GX3M4X1600C10 Dominator 32GB
Case:  Cooler Master CM Stacker 830 nVidia Edition Full Tower
Optical:  LG BD Writer
SSD: SanDisk SDSSDX-480G-G25 Extreme 480GB SATA 6GB/s
HDD:  Several Hitachi Deskstar's

[dmdilks]

Try and disconnect all your SDD, HHD & CD-roms. One them might be the problem.

[nickweavers]

Well I had used the SEARCH button in this forum page to see if the problem had come up before but it didn't find anything. However, the same search on Google got me to this post http://forum.giga-byte.co.uk/index.php?topic=9026.0

Sure enough, it was a monitor issue for me too and the A6 may have been Ab as was commented there.  I would have thought though, with 7 seggment LED display's you can't really have a 6 and a b as they would be indistinguishable wouldn't they, so I don't know... but the A6 sure acts like an AB in that it means BIOS is waiting for user interaction.

Anyway, it meant i got my problem cleared.

And thanks dmdilks for your help anyway.

Cheers,
Nick