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ASUS Crosshair V Formula Z hangs on "4A" POST code

post #1 of 10
Thread Starter 
I initially wanted the first thread that I create on www(.)overclock.net to be a presentaion of my system, but since I cannot get my system to run properly, my first thread on this site will be a combination of the discription of my problem and the presentation of my system.

Whenever I start up my computer (I do so by pressing the power button on the mainboard), my mainboard hangs at the "4A" POST code. According to the manual of my mainboard, this code means "SCSI initialization". Also, the vga-led is shining constantly, which would indicate that there is a problem with my graphics card(s). This happens when none, one, or four of my graphics cards are plugged into the mainboard.

This would further indicate that the graphics card(s) are not recognized by the mainboard. As far as I know, this usually happens when the graphics cards are either broken, do not receive enough power, or when the PCIe slot in which the graphics card is plugged into is broken. I had, however, a mainboard (or more exactly two mainboards) before the one I mentioned, with which all four of the graphics cards worked. Actually, I could not really test the full functionality of my graphics cards with my previous mainboard, because before I could fully use them, I did something wrong installing a new bios and then I my computer was not able to boot anymore. I had then sent in my mainboard and had received a "new" one (it was not really new, apparently it was only a repaired one) about a month later, however, apparently the first PCIe slot of this mainboard was broken, since whatever graphics card I plugged into that PCIe slot was not recognized by the mainboard (and also did not output a video signal) and the graphics card I plugged into the next PCIe slot was recognized (and also did output a video signal). I then returned that mainboard to the retailer I bought it from in order to receive back the money that I had spent on the mainboard and then bought the mainboard that I have now.

The following components are of which my computer consists:

ASUS Crosshair V Formula Z
Corsair Vengeance DIMM Kit 16GB PC3-14900U CL9-10-9-27 (DDR3-1866) (CMZ16GX3M2A1866C9)
AMD FX 8150
OCZ Vertex 4 256GB
Seagate Barracuda 7200 2000GB
4x MSI Radeon HD 7970 OC
LEPA G1600
Watercooling equipment for the AMD FX 8150 and the 4x MSI Radeon HD 7970 OC
Dimas Tech EasyHard Benchtable black V2.5

Note: I am aware that the RAM I am using is not compatible with my mainboard according to the QVL (qualified vendor list) that is available on the official website of ASUS. However, after I updated the BIOS of my mainboard (I did so by using its BIOS flashback function) to the newest one that was available (and is as I am writing this post), I was then (and before doing so not) able to use one of the two RAM sticks. I my self am not sure if this has something to do with my problem.

Also, before anyone asks me, I can plug four graphics cards into my mainboard because I reduced each of them to single-slot (using the watercooling).

If anyone who reads this post has an idea on what I could do to solve my problem, I would greatly appreciate it.
post #2 of 10
I had that issue when i put all 3 of myu 7970's on the same bored
8 core 8350
crosshair v-z
16gb of ram (on the venders list) corsair vengeance
8-8-8-24
etc
but there is a molex to the left of the bored by the heatsink
did you put a molex there? as it provides more power to the mobo?


are all 8 and 4 pins at the top plugged in?

did you clear cmos?

press memokay?

maybe try diff card?

=ROG
post #3 of 10
Thread Starter 
I have tried and done everything that you have listed (you also wrote "eight and four pins", as far as I know a Radeon HD 7970 has eight and six pins). As I have written, I tested all of my four graphics cards in the first PCIe slot and then, everytime when I started my mainboard, it stopped at the "4A" POST code and the vga-led was lit.

You wrote that you had the same issue. Did your mainboard show the same things as mine? What did you do to solve it?
post #4 of 10
no the 8 and 4 pin at the top of the mobo (some people use 4 and 4 pins thinking it does not need the 8 and 4

and i plugged in the molex by the heat-sink and it worked , but then I ended up doing RMA cause the bored would not post after that the light above gpu would blink lol so i think might need a RMA
post #5 of 10
Thread Starter 
Did you plug in the power connectors for the eight and four pin ports on the mainboard? I only plugged in the eight pin power connector. As far as I can see, my psu does not have a four pin out.
post #6 of 10
you need the 4 pin at the top
post #7 of 10
You don't, I just literally (less than 10 minutes ago) got my FX-8350 back up to 5.01 GHz on just the 8-pin, you could use the extra 4 pin just for extra juice, but it's not required along with the 8 pin..

If you have a Crosshair V Formula-Z, then you know where the 8 and 4 pins are, and note that my 4 pin isn't occupied at all. As for the "4A" code, I literally just searched through my whole manual for the Post Codes, and couldn't find it frown.gif my board does the same thing to me, it's annoying but you'll figure it out rolleyes.gif it also could possibly your four GPU's, go through the bios and find the GPU and Memory Post tab, to see if all four are detected. Sometimes that can prevent a system from posting at all, just to double check it wouldn't be a bad idea.




Good luck!!! thumb.gif
"D'yer Mak'er"
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"D'yer Mak'er"
(46 items)
 
 
Stronger, Stiffer, Cleaner.
EK Waterblocks R9-290X Reinforcement Bracket
CPUMotherboardGraphicsGraphics
Intel 3930K (4.411GHz @ 1.35V) Asus Rampage IV Black Edition Sapphire Radeon R9-290X (1010/1260) Sapphire Radeon R9-290X (1010/1260) 
RAMHard DriveHard DriveHard Drive
Corsair Dominator GT 16GB Kit @ 1604MHz (9-9-9-24) Asus Raidr 240GB PCI-E SSD Samsung EVO 250GB Samsung EVO 250GB 
CoolingCoolingCoolingCooling
(X3) NoiseBlocker BlackSIlentPro PL-2 @ 5V Bitspower 45* Single Rotary Adapter (Matte Blac... (X3) Bitspower Chrome Stop Plug (W/ Black O-Ring) (X2) EK Monarch (Nickle Base, Clean Acetal Top) 
CoolingCoolingCoolingCooling
Bitspower Mini Valve (Matte Black) (X4) NoiseBlocker eLoop B12-2 @ 7V (X3) NoiseBlocker/Phobya eLoop Black "Silent Ed... (X4) NoiseBLocker BlackSilentPro PK-2 @ 7V 
CoolingCoolingCoolingCooling
(X1) NoiseBlock eLoop B12-PS Bitspower X-Station (White) (X3) ModMyToys Splitter PCB (Single 3-Pin --> 5... Bitspower Acrylic Pump Top 
CoolingCoolingCoolingCooling
ModMyToys Splitter PCB (Single 3-Pin --> 3 3-Pins) (X2) EK-FC R9-290X Nickle/Acrylic (X2) EK-FC R9-290X Reinforcement Brackets (X2) EK-FC R9-290X Backplates 
CoolingCoolingCoolingCooling
HardwareLabs BlackIce SR-1 360MM  HardwareLabs BlackIce SR-1 560MM  BItspower Black Mod Kit XSPC D5 Vario 
CoolingCoolingCoolingCooling
Bitspower 150mm Reservoir (Acrylic base, clear ... (X14) Bitspower X47 Acrylic Fittings (Matte Bla... (X3) Bitspower Dual Rotary Snake Fittings (Matt... (X4) Bitspower 90* Angled Fittings (Matte Black) 
CoolingCoolingCoolingOS
(X2) Bitspower Enhanced Dual 45* Multi-Link Ada... (X3) Bitspower Enhanced Dual 90* Multi-Link Ada... Bitspower Pressure Equalizer Stop Plug (Matte B... Windows 8.1 + Full Office Suite 
MonitorKeyboardPowerCase
BenQ XL2420TE Logitech G710+ Silverstone Strider Evolution 1000W (Sleeved by... CaseLabs SMH10, XL Window, standard ventilated ... 
MouseMouse PadAudioOther
Razer Ouroborus  Akasa Venom XXL Schiit Asgard 2 (soon to be happening) (X6) Silverstone 120mm Magnetic Fan Filters 
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(X4) Silverstone 140mm Magnetic Fan Filters Vintage Soviet Ushanka Over Monitor, For Good Luck 
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FX-8350 Asus Crosshair V Forumula-Z MSI R7970-2pmd3gd5/oc (water cooled) Corsair Dominator Platinum 
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WD Black  Windows 7 Home Premium  Samsung Syncmaster S20B350H Razer Anansi 
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post #8 of 10
I got this same problem with 2 HD 7950s when I flashed the cards with 7970 BIOS since they had 7970 PCB. Works fine on my regular crosshair v but when I got the z version I get a 4a and it hangs or I just get a code 99 so I even rmaed and it was the same problem I just put it back in the box and I'm waiting on a BIOS update that might fix this problem. Runs fine with stock BIOS but cards don't overclock as far so I'm sticking with the regular one for now. Its a good back up though.
Intels D.C.
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Intels D.C.
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post #9 of 10
Are you using ROG Connect to help diagnose your boot problem further?
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post #10 of 10
I haven't and have no idea how
Intels D.C.
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Intels D.C.
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Lg CD/DVD Burner internal Drive Lg CD/DVD Burner external drive  Coolgate 360 Rad 60mm, Coolgate 240 Rad 60mm, K... Windows 7 64Bit Ultimate 
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