Dv7 1245dx, which fix (out of 3) should I try?

Right now I'm looking at a dv7 1245dx with nothing attached to it but the speakers, monitor, keyboard and audio jacks. The laptop has a blank screen and blinking caps \ num lock. According to the site, this means there is a problem with the A/C. There has been issue with tilting the cord to get the computer to start but everything looks ok and is not loose.
So basicly I can try replacing the motherboard
replacing the cable
replacing the battery
or trying to fix the powersupply (which doesnt look broken from what I can see)
I've tried all the fixes from the site. Just not sure if this happens all the time and it is just another dead motherboard. If that is the case I might just try baking it! I'm also open to other suggestions
This question was solved.
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Here is the Manual, which you are clearly going to need:
Manual
See Page 34. It is possible to replace just the power jack separately. No soldering.
Here is the part on eBay for $3:
http://www.ebay.com/itm/New-DC-Jack-Power-Cable-for-HP-Pavilion-DV7-1000-Harness-DC301004S00-/310406...
This may or may not work. The AMD versions of the dv7-1000 series have had some motherboard issues and it may be that. If so, I would not bake it but for $70 or so if you can remove the motherboard, there are competent shops hawking their services online who can do a proper reflow with real equipment. Bake jobs tend to fail after 30-60 days. A proper reflow can last a couple years.
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Dv7 1245dx, which fix (out of 3) should I try?

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