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Chinese made aftermarket AC Adapter for HP DC7900 USDT Ultra slim Desktop. This adapter has no standard part number on the unit. The side has a sticker with YALL-2014-10 , S1135 . The main label on the underside reads: Replacement AC Adapter INPUT 100-240V 1.5A 50/60Hz OUTPUT 19V 7.1AChinese made aftermarket AC Adapter for [[HP DC7900 USDT Ultra slim Desktop]]. This adapter has no standard part number on the unit. The side has a sticker with YALL-2014-10 , S1135 . The main label on the underside reads: Replacement AC Adapter INPUT 100-240V 1.5A 50/60Hz OUTPUT 19V 7.1ABLUE to WHITE - place the resistor between the blue and white wire.REMEMBER - The voltage will read much higher than 5 volts when not under a load. A resistor is _not_ a voltage regulator. The loaded voltage drops to 5-6 volts on the center pin when connected to the computer and the computer is operating.FINALLY - This is the correct relative resistor value for this particular computer system: [[HP DC7900 USDT Ultra slim Desktop]]. Other models including HP laptops have different current pulls, they are different loads, and therefore a different resistor value will likely be needed.