Faulty motherboard or cpu?

Yes I will do that no doubt! Do they normally test the mb completely before sending back to make sure everything is working?

Thanks for the help everyone!
 
Had the same exact problem checked and re-checked everything. I did send the mobo (gigabyte z77-d3h) back but the replacement was the same. A different psu had the same results, took out cmos battery, used 1 stick of ram everything had my computer expert uncle have a look and still the same and as I had already had a replacement mobo it must be the cpu, so sent that back and awaiting a new one next week. One thing which was strange was the stock cpu fan not spinning upon start up but an after-market cooler did.
 
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