Help Rebooting issues

[jkm2282]

I am facing a peculiar problem while rebooting my phone. When I try to power the phone on, 8 out of 10 times, it gets stuck at the "M" sign and doesn't go beyond that. I have to take the battery out and then power it on again which usually makes it works (have to do that more than once sometimes, though). Any idea why it could be happening and how to solve it? Thanks.