Need expert help: Does this look like a dodgy repair?

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I've got an Asus N71JQ laptop which I bought second hand when I was in the states (think it was about 2 months old). I've used it for around a year now, and it's been totally trouble free, apart from last week when it suddenly failed to turn on.
I've tried different chargers, but still no luck - the battery doesn't even charge: nothing at all happens.
It's still covered by asus' warranty, but before I sent it off I decided to open it up and see what, if anything was causing the problem.
The first thing I noticed was the warranty sticker covering the heatsink screws had been broken, but strangely there was two rather than one, although both were damaged. Curiously, the only reason why you would undo the screws would be to access the CPU/GPU, both of which look fine. However, now I obviously can't send it back to asus. Here's a pic of what it looked like if you're interested:
pa200005v.jpg

I decided to check out the DC jack, as that seemed the most likely culprit as no power was getting to the laptop at all. Having taken a close look at the solder joints, I believe I may be right, but I'm not sure. To me at least it seems like it's been repaired in the past - the solder looks like it was applied by a human rather than a machine, but what do you think? Here's the pictures:
pa200004.jpg

pa200003.jpg

pa200002.jpg

pa200001q.jpg

Even if that was the case, the repair looks pretty good to me. Is it possible that it's the issue anyway? Is it worth paying someone £70 to solder a new DC jack on?

TL;DR: What is causing my laptop to not get any power. If it's the DC jack, is the soldering dodgy?

Thanks :)
 
Okay, so I tested it with a multimeter and was getting a 19v reading on the charger. When I tried plugging into the charger and testing the pins on the PCB the highest result I got was 4.5v. Does that mean there's definitely a problem? I tried pressing the power button on the laptop and there was no change in the reading. Here's the settings I used on the multimeter, I assume they're correct?
 
Solder looks fine, sounds more like a short on the board somewhere.
Looks like you're right: here's what's happened since I last posted
Another forum member very kindly gave up his time to solder on a brand new DC jack for me. When I got home I put the laptop back together and unfortunately the problem remained. Whilst I was there, he also took a look over the board for me for any other possible suspect areas and identified a particular area near the battery charging pins as a potential problem.
I've taken some photos of it, and I would greatly appreciate any opinions on whether it's the problem or not. Higher res photos are available if required
http://img252.imageshack.us/img252/9787/pa280004w.jpg
http://img841.imageshack.us/img841/6719/pa280003.jpg
http://img526.imageshack.us/img526/1107/pa280002n.jpg
http://img714.imageshack.us/img714/8594/pa280001t.jpg
 
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