if you forget a standoff you can short the mb out where it wont post. most tech will tell you to take it out of the case and use one dimm and the power supply and see if it posts. with the newer mb the z77 are you using a sandy bridge chip or an ivy bridge chip..those are the only two that will work. before you do an rma if you can post up more info on what the pc does or does not do and your parts we may be able to see if it the motherboard or a dead part. if you have to rma the motherboard the cheapest and safe way would be to use a mail center like malboxes ect. they hold your mail till you can pick it up. some mail centers have coupons for free month of service.