i was having some over heating problems wit my xbox. I decieded to take it apart, cus it was no longer under warrenty! while doin so i decieded to just fix tha clamps...so i woldnt get the rrod in the future. then i put the motherboard back in the metal tray, and the xbox wouldnt turn on so i took it out....put it back in and it powerd on!.....i put it back together and pluged it in and it did not power on again!....finally i took it apart ....cant figure out what is going on with it?

??can some one please help..

when i get green on the block i plug it in and it immediatly turns red,and does not turn on!....do i got a short?...is it not grounded ? its not the block, because i tried others.......what can it be?...it over heated many times before...but i use to reset it by unpluging the fan and then pluging it back in...it would be fine for a few days.....but now no power....please help thanks......my email is
[email protected] any info is helpful to me! thank you