Why on Gods earth did it take 2 hours even using 1 hand thats a 10 minute job.
Also this is actually your motherboard http://www.gigabyte.com/products/product-page.aspx?pid=3320#sp
Anyway did you at any point remove the CPU? If you did did you put it back properly? Make sure the lever arm was put back down properly?
What exactly is happening when you turn it on? It is sticking on the gigabyte BIOS screen? or does it display a message after that screen? If it is sticking on that screen how many beeps is it making and what type of beeps?