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You can turn off the Mp4 for a while and re-install the system ,and then you can change if the port is fit the computer ,you can also used a transfer interface to connected the computer .
Check power to the starter motor solenoid. If this is getting power when cranking, then the issue is with the starter motor solenoid or starter motor. Replace.
if it turns off as soon as you take of the jumper cables the problem is the charging system. it could be the alternator or relay or a fuse. and after that you need to charge the battery.
If the recharageable battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% and graduallythe charge reduces until the battery won't charge up at all. OR The batteryshows a 100% charge but when the adapter is disconnected the battery drops offto zero capacity in a very short time. If the battery drops to an unacceptablecharge level then the battery needs to be replaced.
For a test
-Remove the battery from the laptop. (leave it out)
-Plug in the adapter and turn the laptop on.
-Gently wiggle the adapter plugged in
If the computer powers off the solder and/or pins have broken loose from the DC jack. This is very common. Average repair bill is around $150, if your in the Denver Colorado Area I can do the repair for about $50
If it won't turn on while you wiggle the adapter and hit the power button then the adapter is bad again sadly
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