Hi Prentice and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, have you tried gently tapping on these buttons?
A strong possibility is that these buttons are stuck/erring and causing a 'HALT' on the bootup process.
An authorized Service Center would be more to your advantage:
Please click HERE.
Or are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?