Hello i have the S40 2007 model, 65.000km, just got an 130euros battery on september
Today i tried to make it start, but it makes weird sounds and won't start..
The radio turns on , the lights go on, but the car wont.
Some strange sounds, like the door locks etc.

 

Check your battery leads (both) for a tight and clean connection including the earth connection to the car bodywork.
Also make sure the connection onto the starter motor is secure.
Have the battery tested to confirm it is actually okay if leads are not found to be the cause.

 

whoops I messed up and responded to the wrong thread.

 

Hope it didn't take 8 years to diagnose that.... ;-)