My Mercedes B. E 300 will not start

If a jump start didn't do anything, it could be the starter is not getting the signal from the key or the starter is bad. --- Try moving the gear lever around and if that does not work, try putting it in neutral.

may need service reset, turn key to position one .press R three times ,scroll to maintenance hold reset 10 sec. this may not the procedure for that model as they vary,year to year model to model ,all similar. may get lucky