My S3 froze - now it won't boot? WTF?

[striff88]

I have an s3 that has been rooted running a custom rom perfectly for about 5 months.

Today I was using my phone and it locked up - totally froze..screen was frozen and everything was unresponsive. So I pulled the battery.

When I put the battery back in my phone displayed the Samsung logo and after that just displays a black screen.

I can put the phone in download mode, however it will only be on the download screen for about 3 seconds before the phone either turns off or the screen goes black.

The really weird thing is, when I put the battery into my phone it will instantly boot up (I don't have to hold download the power button). The power button is NOT stuck in the down position.

I know the battery is charged. So what in the hell happened? I don't know if my phone is bricked or not. I could re-flash it but I can't do anything in download mode because of it turning off.

Any help would be appreciated. Thanks.

 

[GTWalling]

Which variant of the S3 do you have. It helps to post Mode number and Carrier so someone can help.

 

[GSDer]

You could try booting into Recovery mode instead, and wipe the cache/Dalvik cache, just to see if that makes any difference. Or go straight to a Factory Reset.
Sounds like something got corrupted when the phone froze.
When you put it in Download mode, if you then immediately connect it to your computer, does the screen still turn off?

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