For the model PA-1450-26, the dc power jack(The plug fits into the laptop) has two different sizes:
1. Internal Diameter: 1.7mm
External Diameter: 5.5mm
2. Internal Diameter: 1.0mm
External Diameter: 3.0mm
Could you please use a ruler to measure the dc jack of your original adapter
(Or the power port of the laptop, if your original adapter is lost.)?
Then select the right size of the dc jack.
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