My M700 has started acting up. It flips between battery and AC when it's plugged in. Once or twice, it's just shut off. I tried a new AC cord, thinking the old one was shorting out. But the problem persists. I'm thinking there's a problem with something loose in the connection where the AC cord plugs in. How do I check that on my own? I don't want to spend a fortune on this old laptop to have a tech look at it.
There is a DC jack on the inside of the motherboard, It needs a solder touch-up. Chances are good the board has been getting too hot and it cause the solder to tarnish to the point that it is not making a good bond between the board and the jack. A common problem that I fix all to often. But on the M700 I would say that a fix like that would be unrealistic as I have the best prices in town and at $150 it would make the system not worth fixing. Of course as the owner of a computer store I would take it on trade for an upgraded system but not all stores do that. Good luck.
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Since you have already tried using a different cable, it sounds like a loose connection, or a failing power supply. In either case, I recommend you take it to a qualified tech to check it out, before something else more expensive gets shorted out by the faulty electrical connection. It could be a simple part swap would get you back in business with a reliable laptop instead of a liability for your precious data.
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It could be just a coincidence...but lets try a few things...
Remove the battery and unplug from the wall. Hold the power button on...and then plug back into power...after 8 seconds release the power button. Once your computer boots to desktop...shut down...and replace the battery.
Changing the harddrive should have anything to do with teh battery...
See if your battery starts charging after this trick.
Always start with the simplest solution first so start by cleaning all the contacts, AC adapter laptop plug, laptop socket, laptop battery contacts and battery contacts.
How have you confirmed power output from the AC adapter? have you used a voltmeter to ensure you are getting power at the laptop end?
Have you used a voltmeter to test the battery?
Assuming you have tried all this don't forget that almost any component can interrupt power on some laptops, however you're 2 main culprits with this kind of problem are usually power controller (voltage regulator) and in some cases, on a laptop of this vintage, the charge controller built in to the battery.
Try it with a different battery if you have one.
Seems your laptop has been sufferd a lot by the power. i just suggested you to have your mother board check.I think there should be something wrong with your mother board. By the way, did you try powering on it without the battery? If not, you should have a try on that.
Hope you doing good.
Please try the following solution :
1. Disconnect the power cable.
2. Take out the battery
3. Keep holding down the power button for 60 seconds.
4. Put the battery back in.
5. Connect the power adapter
6. Make sure the Power adapter is switched on and laptop is on AC Power
7. Wait for 5 minutes and try to restart the computer
8. If it still doesn't starts.
9. Hold down the power button for 60 seconds with AC adapter and battery connected
10. Try to restart now and check.
11. If it still doesn't switch on
12. Take out the battery and run on only Ac adapter and restart.
Please advise if this still doesn't helps.