x box booting then shutting down

[bnke]

starts out fine i get a green light if i hold pwr button tray opens if i hold reset button as long as i hold it is yellow im playing abes worls or munches odysee goes about to where he gets snagged by his foot then shuts down .no lights just shuts down. if i restart it does not go as far as the first time but shuts down sooner . i have not installed evox on the hard drive yet . should i pull the alladin out and look for pogo pins .looks fine no crosses