May be a power supply issue. What make and wattage power supply are you using?

 

Woops that was pretty bad forgetting to put in psu specs
Antec Truepower 750w

 

It will attempt to boot with just the motherboard/cpu and power supply, but the POST won't complete and it will hang. To completely POST, you need a complete system (ie: motherboard/cpu, RAM, power supply, GPU, and HDD).

Clear the CMOS or if you can enter the BIOS, simply restore the BIOS to default settings.

 

Thanks for the information on what components are required to complete POST.
I have tried to take battery out to reset cmos without any luck, and i am still unable to access the bios in any fashion.
Another thing i should of noted was i am getting the POST beeps, just a single beep that is but at that point after POST it just hangs on the bios splash screen before resetting moments later.
I suspect it is either a psu or mobo problem neither of which i have any spare to test with unfortantly.
Ill be able to borrow some within the next few days but i had thought it might be something that others had encounted before, though searchs on various forums and google provided no clear insight to what the problem was, this was natural tho as it could be anything at all.

 

Instead of removing the battery, you may try finding the CMOS jumper on the motherboard (usually labelled) and moving the jumper to the other pair of pins or adding a jumper to the appropriate pair of pins to clear the CMOS and reset the BIOS. Remember to keep the jumper in place for the required minimum time and to remove the jumper from the reset setting before trying to fire it back up. Sometimes that helps better than removing the battery.

Question - When you say you cannot enter the BIOS in any manner from the splash screen, does that mean pressing the "Delete" key during the splash screen does not work or that the instructions do not appear at the bottom of the screen telling you which keys to press so that you do not know how to enter the BIOS? Gigabyte typically gives you a way to kill the BIOS splash screen and see the POST data. Usually pressing <TAB> displays the POST data during the splash screen. To kill the logo splash screen and see the actual POST data by default, look for the setting in BIOS, usually under Advanced BIOS Settings, and change it.

Also, look and follow the instructions on how to bench test a new PC in the forum. They are very good and may help you identify the issue.

 

Is this a new build?
Bench Test
Remove EVERYTHING from the case
Set the motherboard on a non conductive surface. The motherboard box is perfect for this. DO NOT PLACE THE MOTHERBOARD ON THE STATIC BAG! It can actually conduct electricity! We are going to try and assemble a running system outside of the case.
Install the CPU and heat sink.
Install 1 stick of RAM.
Install the video card and attach the power supply connection(s) to the card if your card needs it.
Connect the monitor to the video card.
Connect the power supply to the motherboard with both the 24pin main ATX Power connection and the separate 4 or 8 pin power connection.
Connect power to the power supply.
Do NOT connect ANYTHING else. Make sure you have the power connector on the CPU fan connected.
Use a small screwdriver to momentarily short the power switch connector on the motherboard. Consult your motherboard manual to find which two pins connect to your case's power switch. Then touch both pins with a screwdriver to complete the circuit and boot the system.

If all is well, it should power up and you should get a display. Then assemble the parts into the case and try again. If the system now fails to boot, you have a short in the case and need to recheck your motherboard standoffs.

If the system does not boot after this process, then you most likely have a faulty component. You'll need to swap parts, start with the power supply, until you determine what is defective.