Having problems with your Sony VAIO SR27K PC Notebook ?

I have note book sony vaio SR-27k but not power in mainboard or not BIOS running ( Blank) pc notebook not running.

Answers :

If there is no power/charge lights on, it is likely the power adapter is faulty or the power socket on the laptop is faulty.
To test the power adapter, test the power plug that plugs into the laptop with a multi-meter. The voltage reading should be slightly higher than the voltage that is printed on the label on the bottom of the power adapter. If the voltage reading is zero or below the voltage on the label then the adapter is faulty and needs to be replaced.
If the voltage reading is OK then the power socket on the laptop could be faulty. Connect the adapter to the laptop and wriggle the power plug on the laptop, it the charge LED flashes as you wriggle, the the fault is the power socket, it may simply have a dry solder joint or it is faulty and needs to be replaced. This requires the laptop to be dismantled to fix/solder the power socket or replace the faulty power socket.
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