Copy the ttgo.bif from the part backup you should have to an SD card, then add a suitable map, navcore & then patch both with Fastactivate.
Put the SD card in and see if you can boot it form there.
If that fails, do a hard reset (hold reset in for 15 secs) then press and hold down the start button until black screen with white letters comes up. Release start button and take a photo of what you see on the screen. Post it on this thread. Try a restart and see if anything happens with/without sd card inserted.