HP Pavilion dv7-4178nr Notebook AC Adapter Charger 19V 4.74A 90W high quality,1-year warranty, 30 days free return.
I have a ThinkPad helix with a 36 W power supply. It was very difficult to find a replacement power supply. ThinkPad didn't even have one available. It was going to take three weeks for ThinkPad to send me a replacement power supply. I don't know about you but I cannot survive three weeks without my laptop. Charger buy had one in stock and I had it within three days Normal shipping. It works perfectly have not had any problems whatsoever. I plan on purchasing a second one. I would strongly recommend using them and recommend them to a friend.
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