not sure what may be going on. You can get into the bootrom of the switch by holding the space bar while connected tot he serial port of the switch. the switch will first go into the bootstrap simply type boot and continue to hold the bootrom. once in the bootrom you can see the commands using the ? for help.
you can factory default the switch using the command config none. then try to see if it comes back. If not then do the same process and try the other image.
If that doesn't work then you will need to call TAC.