<human>: Can you provide a brief rundown of the text in within 3 sentences?

friend of mine came to me saying his laptop won't charge. 

upon inspection I discovered he had broken the port which prevented the cable from making a connection. 

I made him no promises but I told him I could try and replace the port and see if that will work. 

I got the part online I took the comp apart installed the port and at first it seemed to work since I noticed the charge light in the front of the laptop turned on when I plugged it in.

but then the heart breaker happened. it won't turn on. 

he said he had drained the laptop all the way down I mean from the way he explained it, they ran the battery into the ground. 

I thought maybe it just needed an over night charge(I know it can run off the charger alone but I was clinging to hope) but no go. 

took it apart again checked all the connections(power board/power switch to mobo and so forth.) no go, it's possible I maybe didn't get a good connection on the power switch, but before I take this laptop apart and reassamble to no avail, I was wonder if their were any other thoughts on why maybe the laptop won't turn on. 

I had heard rumors that it's possible to fry laptops when letting your comp run off a low battery for a long time. I know that most computers have preventatives in place that will force it to turn off before it reaches the dangerously low voltage. but I didn't know if this was the case on this pc.

 the laptop i'm working on is a sony vgn-ns240e. any suggestions would be greatly appreciated before I have to disassemble this thing again.
<bot>: working on a sony VGN-ns240e, replaced power port, now it won't turn on even though battery charge light turns on.