03' silverado stereo not working

i have an 03 silverado ls with the factory Bose system (6disk) that just up and quit working one day. I've checked the fuses and they are good. If I p ush the power button the back lights for the buttons come on briefly but th ere is no display and no sound. It will load a cd but won't play. If I push the volume button it displays the clock for about 5 seconds and then goes back off. I did find a video on YouTube where I learned that if you push th e #5 preset, the forward seek/scan button and the power all at the same tim e it bypasses something and the stereo works for about 3 minutes and then s huts back off. This can be done a total of three times and after that I hav e to disconnect and then reconnect the battery before I can do it again. Th is truck has been an electrical nightmare! Any help would be greatly apprec iated