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Speakers aren’t emitting sound or the sound is muffled.

Small debris can clog and muffle the speaker grills. Inspect and clean the speaker grills with short bursts of compressed air or a finely-bristled brush, if visible debris is present.

Check for any software conflicts with any installed third-party applications and remove them as necessary.

If sounds still does not return after external cleaning and eliminating possible software conflicts, debris might be inside the device, requiring a more thorough internal cleaning and/or replacement of the speaker.

Speakers make a crackling sound when audio is on.

Playing poorly compressed audio at high volumes can cause a crackling effect that might incorrectly suggest a problem with the speakers. Ensure that the problem is for all sound before assuming any speaker defect.

If the problem continues, consider replacing your bottom speaker.

Crackling sound can also be a symptom of water damage. Ensure the device is dry and, if the problem persists, replacement of the speaker may be necessary.

There does not appear to be any sound coming from the headphones when they are plugged into the phone.

Ensure the headphones are working properly with other devices and are compatible with the HTC One M8. The HTC One M8 has a standard 3.5 mm headphone jack.

If the problem is persists only for the HTC One M8, replacement of the headphone jack may be necessary.

Phone will not transition from portrait to landscape mode when phone is rotated.

Not all Android applications are designed with screen rotation in mind. Verify that the problem is consistent among all applications.

  • Go to settingsGo to Display & gesturesSelect Auto-rotate screen option

  • With two fingers, swipe down on the status barPress Settings button (cog icon)Go to Display & gesturesGo to G-Sensor CalibrationPlace phone on flat surface and calibrate When calibration is done, press OK

The phone’s touch screen is either damaged or isn’t responding to the users touch.

The display is made with Corning Gorilla Glass and is damage resistant. Most scratches will be surface level and cosmetic only. If operation is impaired, proceed with the replacement of the screen.

Background applications might use up too much memory and slow down the phone until it is unresponsive.

  • Restart the phone. Go to SettingsGo to Accessibility Go to ServicesSelect Turn off all apps

If the problem continues, consider replacing the screen.

Phone does not appear to be charging when plugged into charger.

Verify that the issue is with the phone and not with the power source or charger cable. The HTC One M8 needs a micro-USB charger.

If the problem continues, consider replacing the charging port.

Ensure that the phone does not have debris in the mirco-USB port but cleaning it out with small bursts of compressed air. If the problems persists then the port may be damage and a charging port replacement will be required.

The phone does not power on when the power button is pressed.

The phone may have simply lost its charge. Plug in the charger to verify that it isn’t the problem. If the problem persists then boot the phone into safe mode.

  • Press and hold the power button until the Phone Options prompt appearsRelease the power buttonPress and hold the Power off until the ‘Reboot to safe mode’ option appearsPress Restart

If the phone can successfully boot into safe mode than one of the applications is preventing a successful boot up.

If the problem continues, consider replacing the battery.

The device discharges quickly

The battery may need to be re-calibrated.

  • Shut off the phonePlug the charger in and let it charge for ten minutesHold down the power and the volume down button for two minutes while it boots back up

Certain applications may be using too much power.

  • Go to SettingsGo to PowerVerify that no applications are using excess amounts of power.

The camera displays no image when activated.

There may be several scratches on the protective film located on the camera. A replacement of the film may be necessary if the scratches are obscuring the image. If the scratches go past the protective film then a replacement of the camera may be necessary.

SD Card data cannot be accessed.

Ensure that SD Card is a Micro-SD card. Attempting to use a different SD card could damage the phone.

Before using the SD card make sure that you properly eject it

  • Go to SettingsGo to StorageGo to Unmount

Verify with whether the SD Card is corrupt by using it on another device.

The device does not have connection to the carrier network.

Faulty SIM card installed in device. Consider replacing with new SIM card from your wireless carrier.

There SIM card may contain debris. Apply some rubbing alcohol and gently clean the SIM Card off.

Ensure that the SIM Card is the right one for the HTC One M8. The HTC One M8 supports the standard Nano SIM Ca