I've had my 760 X58 Classified running stable for some time, OC'd to 4 ghz on an I-7 quad.  I upgraded to a hex core processor over a year ago, but did not OC it but did go to the BIOS v83.  I have 12 gb ram, 4 1tb WD sata drives in a 2.7tb raid 5 config.  Radeon 7880 video/SB Titanium s/c.  My system is currently failing on reboot, trying to boot then rebooting again while erasing all BIOS setting and hanging on code 50 at that point/ no access to BIOS.  I can power it completely down for a few minutes and it will boot past post enough to get me into the BIOS.  I tell it again the config (raid/ram/cpu)and it will compete the boot to startup.  However, on a hot boot/reboot it will 'double boot' the initial screen, loosing all BIOS settings on the second boot and hanging at code 50.  This is NOT a new build...
long/short story:
It has been running rock solid up until yesterday.  I noticed the Intel Raid s/w indicated the raid was degraded and that one of the drives had dropped out.  It appeared to be completely missing.  I powered down and rebooted/ no change but the system was very slow to boot with the Sata CH 00 hanging for a long period before the raid drives would come up.  I tried to recover the drive to no avail and finally deleted the raid partition in an attempt to recover.  I finally started moving drives around and found that the 00 slot was not reading.  I unplugged/reseated all the cables and it appeared to fix the problem.  However, over the course of rebuilding the installed software, and the multiple reboots for all the M/S updates for Win 7 64bit, the new problem mentioned above surfaced.
I suspect the initial RAID failure and this problem are related, I boosted ICH to 1.2 as I saw in a previous posting.  Did not see a change in boot/reboot behavior.  However, in reviewing the boot sequence I saw the raid had moved down in priority from first boot  leaving a external storage drive and the primary boot.  Reset priority, but no change.  I suspect that this 5 yr old m/b may be starting to become unstable in voltage regulation (no battery warning for BIOS that I can see).  I was waiting for the X99, but now reluctantly have decided I can't wait and will move forward on the X79 Dark.  Any ideas/suggestions?

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