S60 D5 won't start

[cherry1809]

Mate at work had his S60 up in the air at the back, and it slipped dropping back down with a thud. Now it won't start.
If he jump starts it from the front it will, but from the boot it won't. Not showing any faults???

[jamesy12345]

damaged or loose cable from the battery maybe?

[cherry1809]

Possible. There are no accident sensors or anything on these is there?

[LeeT5]

What did it drop on? Did the car hit anything?