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I need to purchase a new ac adapter/power supply. I do not have one to look at, so I’m lost as to which adapter will be compatible. How do I find the tip diameter that fits my laptop?

sharon, you’ll need a 100 ~ 240V 50~ 60Hz DC output voltage 19V DC output current 3.42A Power 65W Connector size 5.5 O.D. x 2.5 I.D mm AC adapter. Hope this helps, good luck.

Toshiba AC Adapter (75W / 3pin / 15V / 5A) PART NUMBER: PA3378E-3AC3 Universal AC Adaptor to power your notebook through your home, or office electric socket. Toshiba’s Universal AC Adaptor can be used anywhere in the world with the appropriate power cord. Same quality, reliability, and specification as the original Toshiba AC Adaptor included with your laptop. Dimensions (W x H xD) 128(W) x 51 (H) x 30 (D) mm Input Voltage 100 ~ 240V 50/60Hz (Universal) Output Voltage 75W (15V x 5A) Weight 355 g

asus atheros/ar5b125 laptop what type of ac adaptor do i need to buy