Colour full BlackBerry ..If you are a Blackberry user.You must read this

The red blinking light can mean a couple of things. First, It could mean that you have a message. If that is not the case, you caould have on the 'LED Coverage Indicator'. The LED Coverage Indicator tells you by having the top light flash eather Green or Red depending on coverage. If you are in a place that has good coverage it wil flash Green but if you have little or no coverage the LED will flash Red. To check if you have this setting enabled, first go to "OPTIONS" on the phone in the full menu. Once there, go to "SCREEN AND KEYBOARD". Click on 'SCREEN AND KEYBOARD" and scroll down will you see the option that says "LED COVERAGE INDICATOR". Click on that and switch it to OFF if it is not already there. Then click the back bottton and click SAVE. That should work. If it doesnt, I would call your phone carrier and ask them.

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LED indicator keeps on blinking (red light) but no screen its water dep i rehot the phone 100%ok done

The four flashes may actually be a "2+2", indicating that there is no software installed on the device.

My wife and I both have Pearl's. I found that the problem on both of them was caused by Color Pearl, an application that allows you to change the color of the Pearl's trackball. It was not a problem until upgrading the Blackberry software to v 4.5. I tried rebooting, removing the battery, etc. The light always came back on after an alert. Removing the application ColorPearl did the trick. Just go to Options>Advanced Options>Applications and delete ColorPearl. Hope this helps someone.