Not charging or wifi connection after new hard drive

My sons laptop stopped working blue screen with code took it to a local repair place they changed the hard drive but now wifi connection is really weak and drops out also it won't charge at all I've tried disconnecting and reconnecting wifi well until battery give way also tried two different chargers one brand new official hp charger no joy the woman said she only changed the hard drive and didn't go near anything to do with wifi or charging but before there was no issue at all with either of the above

Any help would be thoroughly appreciated

Kind Regards

Mr O