P8Z77-M PRO Not booting

richkempo · Jan 11, 2014

Hello,

Recently had hell with my PC. I used to have a P8Z68-V PRO, which I thought had died on me. Was playing BF4 and it died on me. I was ocing slightly, but have watercooling so CPU should have been OK. The PSU did blow on me (was a cheap 750w). So, I replaced the psu with a 750w corsair, and I still couldn't get a boot. So, I thought the mobo was faulty, and bought a new P8Z77-V PRO, and to my delight today, it still won't boot. I have connected it all up (CPU reset, paste applied, EATX in, 24pin connector in, both sticks of ram, GFX). The PC DOES power on for half a second on pressing the power button, then powers down. The only indication I have is the PWR_LED green button is on. I have tried disconnecting all other components, having just the CPU and fan plugged in, with no RAM, and still the same situation.

These are my system SPECS:

P8Z77-V PRO
i7-2600k - Sandy Bridge
Corsair 750 Watt Builder Series CX 750 Modular Power Supply
G-Skill 8GBXL Ripjaws X for Intel Sandybridge Platforms DDR3 PC12800 1600MHz 8GB Kit
GTX 560 Ti MSI
Kühler H2O 620

The only thing which I think might be a cause of the problem is my PSU has the 8 pin connector, and it fits, but the pin shapes dont seem to fully match the socket. Please see pics:

http://imagizer.imageshack.us/v2/800x600q90/560/ehae.jpg
http://imagizer.imageshack.us/v2/800x600q90/577/yg7r.jpg

I am struggling now on what the cause could be. The only thing left to try is the CPU and cooler and try them in another board, but as CPU's are less likely to die, and my CPU fan still powers on, I don't think it is that. Also, my CPU has never gone over 80 degrees.

Any comments and feedback highly appreciated!!!

Thanks

alexoiu · Jan 11, 2014

Hi, For ruling out a short, I suggest testing the board out of the case. Put it on its box, install the stock CPU cooler, connect both 24 and 8 pin power cable (it looks OK) and start the board with only CPU and CPU fan installed. See if still half a second fan spinning.

markwp · Jan 11, 2014

The 8 pin you need for the motherboard is a 4 + 4 configuration, not the 8 pin you are holding. Look for a cable that has two 4 pin connectors side by side, but separate from each other.

Mark

richkempo · Jan 11, 2014

I will try the mobo out of the case. In regards to the 8 pin connector, the 8 pin that I was holding in the picture is the 4+4, just joined together. It also says CPU on it, so I think it is the right one.

richkempo · Jan 11, 2014

Tried with the mobo in the box, only the 24 pin in, EATX in, and psu connected. Still exactly the same problem. I am not able to try the stock cooler for the cpu, as I have since gotten rid of it. I might be able to try my friends one, but is this worth doing? What's the chances of my symptoms pointing towards the cooler? I ask because my cooler seems to power up for as long as the mobo powers up, and stops when the mobo switches off. It is also plugged into the cpu_fan socket. What's my next step do you think?

Thanks

alexoiu · Jan 11, 2014

So still spinning for half a second?
Is there a backplate installed with the new cooler?

richkempo1988 · Jan 11, 2014

alexoiu :

Half a second yea. I have taken the backplate from the old mobo, and put it on the new. It is a plastic one, stuck to the board with pads and the sticky pads are not sticky anymore. But when the front cpu frame is screwed together, it pulls the backplate in. Could there be a problem with it?

richkempo1988 · Jan 11, 2014

Mobo recommend http://www.corsair.com/tx750w.html which says atx12v, but my psu is http://m.dabs.com/products/corsair-750-watt-builder-series-cx-750-modular-power-supply-8GFW.html#specifications which says eps 8 pin. Could this be my problem?

alexoiu · Jan 11, 2014

No. It's the same. Can you test different PSU though?

mattck · Jan 11, 2014

I have said motherboard (its not very good tbh), turn off the tpu and epu switches, the tpu switch is for overclocking, this will make the board to reboot then reboot, reboot reboot... it only stays on for a few seconds every time. if it still doesn't boot, reset cmos, re-seat the ram etc

Sorry do you have the P8Z77-M Pro or the P8z77-V Pro?

richkempo · Jan 11, 2014

Both of those switches are off. I have tried resetting cmos, booting with/without cmos, reseating ram, booting without ram, and it is still the same issue.
I have the P8Z77-M Pro. I have also tried a different PSU, and have the same issues.

alexoiu · Jan 11, 2014

Then it might be a CPU issue.

mattck · Jan 11, 2014

Does it boot for like 1-2 secs then turn off? then turn back on/off again after and after? If so Update the bios using the flash back method to the latest bios.

richkempo1988 · Jan 11, 2014

alexoiu :

Would i be getting these symptoms if my cooler was knackered?

richkempo1988 · Jan 11, 2014

mattck :

No, never longer than half a second. Have tried updating bios, no avail.

alexoiu · Jan 11, 2014

If shorting the board, probably yes.

mattck · Jan 11, 2014

alexoiu :

Mine done this after a bad bios flash, it wasn't shorting the board.

mattck · Jan 11, 2014

you could try the first ever bios for it, think its 801, I had major probs with the bios with this board and the ME firmware, sorted it by flashing 801, then 1504, then 2105. hope that helps.

richkempo · Jan 11, 2014

Successfully flashed to 0801 and 2105, still no joy.

P8Z77-M PRO Not booting

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