My Garmin nuvi 1460 came as a packet with Mitsubishi car which was purchased on January 2011. I just used the Garmin normally, it's never updated. The last time I used the Garmin, it worked normally, but when I killed the car's engine, the Garmin hung, therefore I shutted it down by pressing the power button. Since that time the Garmin didn't work. Everytime I try to turn it on, it stays on Mitsubishi logo.
I've tried :
1. Touch the Garmin's screen on top left corner, then connect the Garmin to PC. Using 'webupdater', Garmin nuvi 1350 was detected (not Garmin 1460?), then communication failed
2. Connect the Garmin to PC, Mitsubishi logo appears, about 10 minutes later "Garmin nuvi 1460" appears under the Mitsubishi logo. I touched the Garmin's screen on the bottom right corner, a bip sound heard from the Garmin
3. Using 'update.exe' > not detected
4. Download software 2.6 version, try to update by double click it > didn't work

I am very grateful to any suggestions from the seniors, thanks.