Motherboard help please!

Saint Chewy · November 5, 2014

So originally I had a Asus P8Z77-V along with a i5-2500k. My original problem was that I was getting more and more false starts. It went from every 1 in 10 times starting the pc, to every single time. I went ahead and upgraded my pc to a Asus Sabertooth Z97 Mark II with a i5 4690k. I even bought a new Evga 750g2 power supply to go with it.

I have everything plugged in and for the most part everything works fine except for a few small problems. Firstly, I dont get false starts anymore (woo hoo!) but every so often my pc will either freeze at the bios flash screen or I will get a 2 or 3 round boot loop. When it freezes at the bios flash screen I have to completely unplug my power supply for about 5 minutes and then it will boot up. When its frozen I cant even access the bios. Also when it freezes the boot_device led stays on.

Secondly, I have two fans that have the 3 pin connector. I have those connected directly to the motherboard headers. They turn on and work fine, however when I shut my pc down everything shuts down besides those 2 fans. I have two fans with a 4 pin connector and those shut down just fine. Even the LAN port in the back still has lights on after the pc is off. Its like my motherboard is still receiving power after being shut down.

So what have I done to try and fix this? I have first reset the cmos by taking the battery out and resetting the jumper. Still doesnt work. I have swapped out my ram and ran a 10 hour memtest86 and have come up with 0 errors. I made sure my SSD with windows was plugged into the first sata port and made it first in the boot order. All my drives pass the SMART test and have scanned for bad sectors. The only thing that worked was plugging those 2 fans with the 3 pin connectors into a molex adapter thats plugged directly into my power supply. When my pc shuts down those fans do too

So my hunch tells me I have a slightly defected motherboard. Does this sound about right? Just would like some feedback please. Sorry for this being so long