boot stuck on MB loading screen

[WolfRayet O]

Hi,
I came home after 2 days to find out my PC has a problem.
When I started it up it was stuck on MB splash for a minute and then a black for the rest of the time.

I have my pc for 5 years atleast and that never occured.
I tried checking each RAM STICK and each hard drive and all usb devices, none of those worked.
I also tried unpluging my gpu, but nothing seems to work!!
Its frustrating, I also tried entering boot menu or bios but it doesnt let me!
Im losing my mind over here

My PC specs:
intel i5 3550
GTX 960 4GB ASUS STRIX
8GB RAM CORSAIR DDR3
500GB SEAGATE
500GB WD
240 GB SSD CORSAIR LE
MB: GA-Z77M-D3H

Thanks for all the helpers!
I tried many solutions.

 

[elbert]

Unplug the system and pull the motherboard battery for 5 minutes. This will reset the bios to default and should let you get into bios. This is unless the motherboard is dead.

 

[WolfRayet O]

Unplug the system and pull the motherboard battery for 5 minutes. This will reset the bios to default and should let you get into bios. This is unless the motherboard is dead.

Thanks alot mate!
I thought I dont need to touch the battery but it fixed it all!
Thanks alot

 

[elbert]

You are most welcome.