bootloader problem ?

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I have a mda compact which when the battery is inserted reads "serial v1:2"
nothing else happens unless the usb cable is conected then the screen changes to "usb 1.2". and the pc says unidentifiable device present and dosen't sync.
any help apriciated ! mda is other wise in as new condition.
The red led iluminating breifly when the usb is conected.

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The mda compact was showing no indication of charging with just a red indicator from the led for 2seconds when the charger was pluged in.
When conected to the PC the screen changed from serial to usb, how ever would disconect after a while and was unable to conect to the mda via the usb as not recognised.
After leaving to charge for a night, with no indication of charging, the MDA did not then self disconect from the PC and so the battery must have been flat !
Was then able to down load the "1.13 T-Mobile rom" on to it from the upgrading link and now all is well.
Still don't know why it was stuck in bootloader mode ?