My HTC was working fine, but I stopped using it for a month then tried turning it on, now it's stuck in a reboot loop. I have tried holding the volume button down and the power button to get into Android system options, but even when I select "restore all settings", it still won't reset and continues to be stuck in a loop. I noticed when doing this that the system screen says the phone is locked. Is this the reason I can't do a reset? How can I fix this?