red light on my sony ericsson w705?

i have a sony ericsson w705 it was working fine then all of a sudden it just turned off and wont turn back on ive tried lots of things to get it working like, buying a new battery, charging the phone for 48 hours but nothing seems to work

when i put it on charge a red light appears next to the end call button and that's it nothing else happens anyone know what the light means? or how i can get my phone working again?
 
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