The phone reboots directly after startup!!!

[dglent]

I changed the sim card and now the phone cannot startup.
After booting i show the desktop and directly it reboots
I putted back the original sim card , same problem
I try to boot it without sim card , same problem
.

I thought about the smscon program which is installed but i dont think that it does this behaviour. I tried this command:
smscon -unboot
the few seconds that i have available , same results

Please help me

[dglent]

i will try to re-flash it , but i will loose the Mobile Maps 10 and the maps that i have purchased ?

[dglent]

if i have the usb cable connected the phone does nt reboot
What can i do to fix it now ?

[dglent]

I ve flashed the phone but the problem is always present.
With the usb cable it does nt restart but when i unplug the cable it reboots immediately
So, i think my phone is dead, i dont know what to do, i think that i have to looking to replace it,
this is the end :(

[Estel]

Try charging battery (externally) ;) And calm down, acting hysterical won't help You.

[dglent]

With the usb cable, it does nt restart only if the file system is mounted in storage mode. If i dont click on pc storage mode, after a few seconds it reboots
With the ac charge plugged it has the same behaviour