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The Device will not respond or show any sign of powering.
Just plug your HTC Inspire 4G phone into a wall charger and let it charge. You can’t just plug it in and try to turn it on immediately — you’ll need to give it a few minutes to charge first. If this does't work then change the battery
use another battery for your HTC Inspire 4G phone or buy a new one.
Speaker doesn't work at all while calling.
Call a telephone number and when conected, tap the Mute icon. Unplug your headset/phones and see if the speaker works.
Take a G-tip with some rubbing alcohol and clean out the hole of the headphone jack
Screen doesn't response when turning the Device on
restarting the phone will solve screen glitches. some smart phones are similar to computers and must be restarted from time to time. if this does not work then try shutting your phone off.
if restarting your phone doesn't work then try cleaning it. Oil from the fave and fingertips can affect some phone screens.