Windows 10: PC power button won't turn on

So, I am having this problem for a while. I have a computer that is 7 years old, although old I am still able to do work with it perfectly until there's a problem. I shut down my computer when I'm not using, but when I try to turn it on by pressing the power button sometimes it doesn't work. Also, sometimes I have to hold on for few seconds to turn on and sometime it won't even turn on. I have no issue with the power supply and everything else works since I'm using this computer to write this question, it just that sometime the power button doesn't turn on when I press it. So, is there a way to fix it? I watched a video on the YouTube that the battery on the motherboard might be the cause that the power button doesn't work, here's the link https://www.youtube.com/watch?v=p2IGjNsaY7E.

So, is it the battery or something else? anything helps as long as I can fix my problem as soon as possible before it turn into something big.

Thank you.

:)

 

Unplugging power cord and holding the power button. PC won't turn on

Okay so I attempted to fix a Windows 10 usb problem by following a month old forum. The instructions were:

1. Unplug the power cord from desktop computer.
   
2. Hold in the on/off button for approx. 10 seconds until the light goes off. This kills the reserve power.
   
3. Unplug all of your USB cords from the back of your machine as well as any flash drive or any other USB
   device that is plugged into your computer.
   
4. Insert the power plug back into your computer and power it up. Allow it to completely load everything
   that it needs to before you do anything else.
   
5. Now start plugging your USB devices back into your computer one at a time while waiting for them to
   indicate that they are recognized. Do this with each one of your devices until all have been recognized.
   
6. Now right/click on computer or This PC and choose Manage / Device Manager /USB Serial Controllers and
   check to see if any of them have the yellow tag. They should not have if the problem is corrected.
   

Unfortunately I only got to Step 4, when I press the power button nothing turns on. So now I'm at a complete loss. The only thing that seems to turn on though, would be the lights to my led keyboard when I plug it in. Anyways, how do I fix/turn on my PC again?

Here's a link to the forum: SOLVED - Unknown USB device in Windows 10

 

Asus Transformer t100ta won´t turn on Win10

Yesterday was reading on it. All of a sudden turned off and now it won´t turn on

 

PC doesn't power down after holding power button for 4 seconds

The power button on a PC is temporary push switch. It makes contact as long as you hold the button down. Quick press and release triggers a smart relay on the MB to turn on or off, depending on default or OS state, such as cold on, sleep on, turn off, sleep off, etc. Holding the button down for a long time is a default hardware power kill switch. If it's not working, suspect the MB. Reset the BIOS is a good suggestion, but prolly won't work.