My mac pro's power adapter has something wrong, sometime can work, sometime dosen't, can you fix it?

my mac pro's power adapter has something wrong, sometime can work, sometime dosen't, can you fix it? i brought this mac pro last year.

No, we can't fix it. Probably live half the world away from you and don't have telephatic powers....
But you can try yourself. First, make sure the connector is absolutely clean. The gold pins on the cable end should all move freely and fully extend out. The gold pads on the Mac connector should be spotlessly clean, and the area around them, where the metal ring on the cable goes in, should be free of any debris that may impede full seating and contact.
Next, the cable on the power brick should be in good condition, without kinking or fraying. If there is any damage, only solution is replacement, it is not serviceable.
Lastly, make sure the battery is ok. Go to the About This Mac item in the Apple menu, do More Info... / System Report... and select Power on the left column. In the Battery Information, Health section, make sure the Condition is Normal. Else, will need replacement.

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