S60 does not reboot after empty battery

Dear all,

I had my S60 in the drawer for 5 days, after which the battery was empty and watch did not turn on.

I recharged the battery - and now the watch does not boot / power on. The display shows the green triangle sign - thats all. No backlight, no reaction on pressing any button. Same when I connect it to my comupter with Garmin Express. Niente, Nada, Nothing, Nichts!

It's a S60 APAC Premium on Version 4.0.

Any ideas to reanimate the dead body? Is there a way to reset the watch with the buttons / a combination of buttons?

UPDATE: Solved - after consulting the manual (yes, it pays to read the instructions - at least once in a while). I pressed the middle button for 15sec - then the watch powered off and could be started again (without loosing settings or data).

However - not the watch no longer connects with Garmin Express on my Macbook.