Are you rooted? If so, what custom recovery do you have?
Originally Posted by
SuperRecoder123 So i pressed the Power button for a fairly long time and now the device is shutdown. (Totally shutdown). I tried restarting but to no avail.
Originally Posted by
SuperRecoder123 It says E: cannot mount cache/logs something like that
Based on these comments, I guess your device isn't completely shutdown - are you getting this message about "can't mount cache" in recovery? How are you getting to this?
Try what bjrosen suggested - (note that it will wipe out your phone).