Phone randomly black screens, forced to remove battery and reboot I have looked through the site, and it doesn't seem this has been answered yet.  Once a day, at some point I pull my phone out of my pocket and it refuses to wake (black screen only).  It isn't off, because the power button does nothing. I have to remove the battery in order to reboot the phone.  I have looked for an app to help me find the cause (i.e. Log Collector) but it doesn't help because this isn't as simple as an FC, I am unaware when it happens until I pull my phone out.  Is there a way to debug/find the culprit?

My info: Samsung Galaxy Gio GT-S5660, Froyo, rooted
Note: I am running SetCPU (no profiles) and Tasker, they are suspects but I haven't been able to get an app to give me a continuous log.
I think I had the same problem recently. When I pressed the phone's power button to wake it up, the display would turn on, but stay completely blank. It happened multiple times a day for me and I got frustrated, so I tried three things and one of those seems to have fixed the problem. Knock on wood.


I reformatted my external SD-Card.
I removed almost all of my media files from the phone.
I disabled JuiceDefender's CPU frequency scaling


My prime suspect was the SD-Card, because the problems started to occur, when I inserted it, but I cannot be sure.