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<i>It does take a charge and runs on battery</i> &lt;-- So the battery is OK, and it looks like the A/C Adapter is OK as well. <br />
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I suggest it is the power supply circuitry inside the machine and since the power button is not working properly, it is probably not just a loose power jack. <br />
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So unless the power circuit is separate (usually not) you are likely looking a motherboard here. Make sure the computer is worth that kind of repair.
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It does take a charge and runs on battery <-- So the battery is OK, and it looks like the A/C Adapter is OK as well.

I suggest it is the power supply circuitry inside the machine and since the power button is not working properly, it is probably not just a loose power jack.

So unless the power circuit is separate (usually not) you are likely looking a motherboard here. Make sure the computer is worth that kind of repair.

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If the Notebook is plugged into an AC outlet, try another power outlet or another power board to verify that the AC outlet is providing adequate power.<br />
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Disconnect the AC power, remove the battery pack, press and hold the Power button for 20-30 seconds. Re-insert the AC adapter and see if it will power on.
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If the Notebook is plugged into an AC outlet, try another power outlet or another power board to verify that the AC outlet is providing adequate power.

Disconnect the AC power, remove the battery pack, press and hold the Power button for 20-30 seconds. Re-insert the AC adapter and see if it will power on.

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could be something is inserted between these buttons, blocking the power button -and making the the other button press the switch
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could be something is inserted between these buttons, blocking the power button -and making the the other button press the switch

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I had already checked the battery and power pack, both OK and with proper voltage and amps. I took off case, found no visual physical issues. checked power button, it physically works. None of these suggestions help so far.
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I had already checked the battery and power pack, both OK and with proper voltage and amps. I took off case, found no visual physical issues. checked power button, it physically works. None of these suggestions help so far.

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@rhwinte - Thank you and I was happy to help.
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@rhwinte - Thank you and I was happy to help.

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Laptop will not power up using power button, power and charge lights on constantly. It will start and run if I press the assist button. It does take a charge and runs on battery
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Laptop will not power up using power button, power and charge lights on constantly. It will start and run if I press the assist button. It does take a charge and runs on battery

Sony Laptop VPCEJ1AFX power button not working

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.

Laptops Notebooks

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.