Why my power and up volume button not working

@muhammadtauseef could be an issue with the volume & power button flex cable. Of course, it is also possible that the actual power button is not making proper connection with the switch. Since iFixit does not yet have a guide for this, use something like this video or even this one. The second video is far more difficult since that applies a jumper across components. The repair flex cables are readily available at many online stores.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!