Intel DX58SO LGA1366 POST Failure

------------------------------------------------Specs:

CASE / MOBO / RAM / CPU:
HAF 932
Intel DX58SO Socket LGA1366 Motherboard
Intel Core i7-920 2.66Ghz 8M LGA1366 CPU
OCZ Gold Tri Channel 3072MB PC10666 DDR3 1333MHz

PSU:
Ultra X3 1600w PSU

HDD / OS
Windows Vista Ultimate 64-bit
Seagate 500GB Serial ATA HD (7200/16MB/SATA-3G)

PERIPH:
LG 22X DVDRW SATA
ULTRA 3.5 FLOPPY DRIVE W/MULTI CARD RDR
Creative Labs SB X-FI Titanium Fatal1ty
Diamond Radeon HD 4870 X2 2GB PCIe

----------------------------PROBLEM DESCRIPTION:

Hi everyone, I'm new here but I've found this site to be VERY helpful so far so I thought I'd drop in and see if I could get some help! I've just finished building a new system that I'm very excited about. The system seems to be functioning fine, but I'd say every 1/5 times it fails to POST. It basically loads up the Video Driver Screen, and then hit shows a _ cursor key in the upper left corner and hangs. All fans and LED's are functioning, and I have onscreen video. The HDD Light stays on(but it stays on when idle), and the keyboard NUMLOCK is stuck to on as well(cant turn numlock off or capslock etc indicated no response from keyboard). The DVD-R can still be open/closed, and the flash card reader light will go on and off if I take a card out.

It would be EASIER for me if it failed to post everytime, then I could remove peripherals and see what is causing the failure, but because it fails to post at what seems to be random occasions I can't troubleshoot.

I would like to note that it has never failed to post on hard boot/reboot but fails to post on a soft reboot (OS reboot) - At first I thought it was failing to reboot at all but indeed a soft reboot (os reboot) will sucessfully reboot the machine, show the video card screen but instead of showing the fancy intel startup screen with the BIOS info it just freezes. However, I can't get it to fail on every soft reboot (os reboot) but only once in a while. Does anyone have any ideas? Thank you in advance!

I seem to have somewhat the same problem.

1) HDD LED is always on, even when the HDD is idle, blinks when there is HDD Activity

2) During POST there are 2 flickering lines in upper half of screen after the splash screen and also on hte next screen where you see the CODES on the lower right of screen.

Should i Update the BIOS. And which method should i follow to update the BIOS. I have been reading a lot about BIOS update failure. Thats keepign me away form updating the BIOS.