after testing both sorts of MagSafe-adapters (L- & T-shaped) I found out and easily can reproduce the following:
The _new L-Adapter *won't supply the computer (green light ) nor load the battery*_ after RESTART/RECONNECTION
IF the battery in the macbook pro (early 2008):
+ was never loaded before with a new L-shaped adapter
+ previously was charged by an L-shaped adapter and changed its LED-status from orange to green
(i.e. the battery is full)
-> shutdown, pop-out and back-in the battery and restart. -> power supply or battery-loading runs fine.
The power-supply or battery-charging will work even after shutdown and reconnection if
+ the battery was previously charged by the new L-type magsafe, but charging had not yet finished
(i.e. LED-status stays orange) -> it'll continue charging after restart/reconnection
(annot.: restart/reconnection = shutdown, disconnect computer from power supply and reconnect again, and boot again)
In every situation, the old T-shaped MagSafe works flawlessly - this means you can connect and disconnect it any time you like and it will charge or supply with power (green + orange led).
As soon as you use the new L-shaped MagSafe and the computer is running at full battery (green led) and you shortly disconnect and reconnect it, it won't work anymore and you have to restart/pop-out-in battery again .......
interestingly there seem to be new L-shaped MagSafe's that seem to work perfectly, you can check it in stores, where macbook pro's are running and being supplied with power.
please everyone tryout the situations described above and let's see your feedback !!