What is this red exclamation mark on top of yellow triangle?

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AC Question

red exclamation mark on top of yellow triangle

At times my phone seems to freeze. Two days ago a yellow triangle with a red exclamation mark pop up and my phone wasn't turning on. Have to remove the battery and place it back and then it turn on. What could be wrong with my cell, is a ZTE android.
 
Re: red exclamation mark on top of yellow triangle

Welcome to Android Central! What were you doing when the triangle with the exclamation makr appeared? Did it fill the screen?

Which exact ZTE phone is it? Does it have a microSD card inserted? If so, maybe it's corrupt, which can cause various problems. Unmount the card (in Settings>Storage), remove it, and reboot. Put the card in your computer and run chkdsk to look for bad sectors: http://forums.androidcentral.com/am...guide-using-chkdsk-fix-corrupted-sd-card.html
 

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