Z77A-GD65 Multiple BIOS Issues - B4 Hang, Splash Screen Blinking

Question

Back in November 2012, I built a home server with a Z77A-GD65.  Lately, I've noticed some strange things happening that I've been trying to research but to no avail.
First off, I get the B4 code hang-up whenever I'm booting.  This doesn't matter if it's a cold boot or a reboot, it hangs on B4 for about 10-15 seconds, flashes 92 really quick, and then goes to A2 which it stays for another 5 or so seconds.  After that I get the MSI splash screen for about 1 second, then it blinks 5 times.  After that it goes into Windows just fine.
The blinking is a new issue, the B4 hang is not.  I've read from multiple posts that this is a USB issue.  When I disable USB legacy support, the issue goes away, but of course then I can't have legacy support.  I have yet to figure out what exact device is causing it.  In the process of trying to figure this out, I updated BIOS to A.A0.  After updating to this version of BIOS the splash screen blinks 5 times before going to the "Starting Windows" splash screen.  This is a more difficult issue to figure out why it's doing this because if you search for "BIOS" and "flash" or "flashes" or "flashing", you typically get results for flashing your BIOS.   Hence, why I'm using the term "blinking".  But even then I can't really find a solution out there.
I also happened to see that the website for the Z77A-GD65 is showing a newer BIOS version, but I'm unable to flash this (at least using M-Flash).  I threw it on a USB, re-enabled USB legacy and whenever I click on it to install, the BIOS screen hard locks.  The screen just freezes exactly where it's at in the BIOS and the mouse is dead.  However, I can CTRL+ALT+DEL on the keyboard and it will reboot the system so I don't need to power cycle the computer.  Not sure why this is happening either.  Perhaps I need to flash this a different way?  Maybe I don't need to flash this at all?
I could really use some input here on why this is happening.
As for the specs on my system, they're as follows:
i7-3770K overclocked to 4.2 Ghz by using the Turbo Mode in BIOS
32GB Komputerbay DDR3 PC3-12800 1600MHz DIMM with Low Profile Blue Heatspreaders Quad Channel RAM | 9-9-9-24 XMP ready
AMD PowerColor 7870 Myst Edition GPU - currently not overclocked although overclocking this doesn't seem to affect any issues
2 - 128 GB Corsair SATA III SSD - one runs the OS, the other I use to load games from
2 - 500 GB Seagate Barracuda 7200 RPM Sata II HDD's mirrored via Windows 7
1 - 750 GB Seagate Barracude 7200 RPM Sata II HDD
1 - 1 TB Western Digital MyBook USB 2.0 external
2 - 3 TB Seagate USB 3.0 external
ASUS DVD Burner - not sure which one, it's a cheapy $20 from Newegg
1 - PCI USB 3.0 expansion card
Antec TruePower New TP-550 Modular 550W Continuous Power ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Active PFC "compatible with Core i7/Core i5" Power Supply
NZXT Switch 810 gunmetal - currently have 4 fans running but plan on more, also the Switch 810 has the multi-card reader in the front with 1x SD Card, 2x USB 2.0, 2x USB 3.0
for peripherals
1 - Microsoft 360 Wireless controller adapter (legit one, not the knockoff although I had a knockoff prior to getting the real deal)
1 - Logitech Wireless USB Keyboard with Touchpad
I tried to be thorough.  Thanks in advance for any help!

Answer 1

Quote from: PirateDog on 26-August-13, 12:45:18
Probably a USB device problem.
This is a candidate, as well as mouse and keyboard. Disconnect USB devices one at a time to find the culprit.
A lot of devices running. PSU a +12V single rail or is it multi rail? A rail going to the graphics or components may not be enough amps. My best guess is the card reader.
For UEFI/BIOS flashing, select your mainboard here and use the forum flash method;
I'll definitely try unplugging some of these USB devices to see if that helps with the B4 hang issue.
As for the PSU, according to the description for it on Newegg:  "Four industry-leading independent +12v rails are provided for more stable and safer power output."  It has two rails going to the GPU.  The GPU is a new addition to the system and so I wasn't running it until recently.  The issues were occurring beforehand, but you're right that this PSU is underpowered for the rig considering PowerColor recommends a minimum of 500w.  I'm going to be buying a larger capacity one sometime in the very near future.  Any recommendations on good modular PSU's?  What's a good way to tell what wattage to get?
Thanks for letting me know about the forum flash method.  I'll be back later when I have some results.