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I haven't been able to find much about this particular model. I take it that you don't have the original power adapter, because it's usually labeled on the black box what the voltage should be. My only other suggestion is to look on the back of the amplifier. there is usually a label next to there the plug goes into the amp that will say what the input voltage should be. Best of luck
Check out newegg.com they often have a wide array of power supplies at a reasonable cost for sell. Make sure of the power supply watts and the connector type, once you have those two things search the site for a replacement. Remember to do an internet search for discounts or coupons, as you can sometimes find codes to enter on newegg to get a discount.
All you need to know is how poerful your computer is, that is find out how much power the equipment installed is using, then you can replace the power supply with one that meets the computer needs. Make sure of the type of power supply connector you have Atx etc. You can go with any brand, so as long as it's the correct connector type, and it has enough power to run your system.Things to note is the manufacturer of your graphic card, and the processor type, as they have different power requirements, graphic cards are usually the most demanding.
This is battery problem, since it work with your computer directly, you no the computer power supply charge it directly so all you need do now is to get another battery and make sure you charge the new battery for some time before you power on.
I had the same problem. my m4002a wouldn't charge or anything. So I decided to take it apart to see what I could see. There are four solder points on the headphone/charge jack that are soldered to the ic main board. Two of my solder points were cracked, so I just melted the solder and bingo it works fine now. I added a bit of highstrength hot glue to the port so it wouldn't move anymore. That seems to have done the trick. I am guessing by maneuvering your headphone jack you are actually causing the solder points to make contact with the ic board. Of course you may not have the exact problem I had but it could be worth a shot.