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New laptop adaptor/charger. Volt and amp doesn't match original

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This morning, my HP Pavilion dv8t 1000 clicked off and would only turn on for a few seconds before clicking off again and again. After removing the battery and leaving the laptop plugged in, the laptop wouldn't turn on at all. At Best Buy, I was informed that my charger was defective so I bought a 90 W charger from Targus. Problem solved. However, later I did some research and found out that my original adaptor is 18.5v and 6.5A while the replacement is 19.5V and 4.61A. 120W vs 90W. I would have to order and wait a week for delivery to receive a 18.5v, 6.5A adaptor. In the meantime, is my laptop safe? From my research, the voltages need to be exact, which they are not, and the replacement adaptor's Amp needs to be at least that of the original, which it is not. Zero for two. Nevertheless, my battery did recharge. I disconnected the three external drives I usually have connected and my laptop hasn't done anything strenuous such as burning a DVD. A local retail store wouldn't have my original adaptor. I would have to call repair shop after repair shop and luck out that one has my adaptor. I am wondering if I reduce my power consumption by connecting only one external hard drive, my laptop won't risk being underpowered.

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