If your phone won't turn on or boot up, then there's probably something wrong with its hardware or software components. The most common reasons for this problem are:

• Software corruption due to malware attacks or virus infections
• Corrupted firmware due to improper flashing procedures
• Damaged hardware components such as RAM chips, hard drives, processors and other internal components.

Solutions

Try charging your phone with a different wall adapter and cable. If your phone still won't turn, hold the Power button for at least 10 seconds. If the screen doesn’t light up or if you hear a sound, release the button and try again.

If the screen still doesn’t light up, press and hold down the Volume Up key with one hand while pressing and holding down the Power key with your other hand.

If the problem persists then contact a professional phone repairer for further assistance.