Console turns on but displays no image and drive will not open

Hi all,

I picked up an Xbox from a garage sale, and when plugging it in and turning it on, no image would come on the screen and the disk drive would not open (pressing the eject button would cause the light around it to flash but that was it). After a disassembly, we couldn't identify anything right away, and after putting it back together the disk drive opened fine and the console was functioning properly. After putting a game in, a few minutes in it said there was a problem reading the disc. After turning the console off then back on, the original problem occurred again. I don't have a lot of familiarity with the system, could anyone help me identify what the issue may be? Thanks