If the central locking stopped working after she replaced the battery it is possible you may have to resynch the key to the car as the radio frequency may have reset. Follow the below steps or look up resynch my key in the owners handbook :- 1- Insert key into ignition 2- Turn key to position 2 (radio on engine off) 3- Press and hold any button for a slow 5 count 4- Remove key from ignition and try buttons PS DONT go to a dealership if you do end up replacing the key. Other businesses will charge upto 70% less. Good Luck
NES pin connecter compatability Clean the 72 pin connector, this should help. You may also need to clean the cartridge connector if it is isolated to the one cartridge. Alternatively replace the 72 pin connector (ebay). I recommend cleaning first to save cash. Update (11/16/2018): Why won't the screen and red light stopping blinking? Why won't the screen and red light stopping blinking?
This can be replaced. Look up “PS2 SLIM LASER REPLACEMENT” you can replace to laser and mechanism together for about £15 Update (09/21/2018): PlayStation 2 Teardown This may also help PlayStation 2 Teardown