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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 7.1A* The inner ring (2) voltage tests: 19.63 VDC* The smart pin (3) voltage tests: 0 VDC (unloaded)An important consideration in purchasing your AC Adapter is that it will supply sufficient Amps. The amperage rating determines how much laptop or computer it can handle. This guy claims to be a whopping 7.1A which is plenty. It is a large unit which doesn't look like the one pictured in the advertisement.BLUE 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.