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Re: find replacement ac adapter
If you are in united states
call 1-800-915-3355 provide them your system's service tag you will get an ac adapter if you r not in united states
provide me your system's service tag located at the bottom pannel of your system, turn it upside down you will find a bar coded sticker which has a 7 digit alphanumeric number
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Most likely, if 3 different known good AC adapters will not power the system, then there is a problem with the DC in power jack on the motherboard. The easiest fix is a motherboard replacement (about $100 on ebay)
Try re-installing the ATI Redeon graphics driver (video driver). If problem persist, I suspected its your video card is having a problem. I believe it is built in on your machine. So you need to replace a system board.
If machine is under warranty, no need to pay for the repairs.
If the system shows no power indication when trying to power on or if you get only a momentary flash of the Power LED, then it goes off, the first point to check is the AC Adapter. If possible, try a known good adapter from another D-Series Dell. Check the LED on the AC adapter to see if it is ON before connecting it to the system. If it is and it goes out when you plug it to the system.
If the LED goes out and no other adapter is available, then I'd start with a new AC Adapter. (If you have no known good adapter available, you might try taking it to best buy and see if they can connect the system to a known good there to see if it powers on).
If replacing the AC Adapter does not resolve your issue, the motherboard is the next component to replace.
I agree. Try to turn on your computer using the ac adapter only. If the system won't hold power using the ac adapter. I suggest to call you computer manufacturer to check the warranty . I am seeing a problem with the motherboard.