Hello, my galaxy s3 died one day last year and I haven't been able to resurrect it since..inserting battery results in a vibration, samsung logo, then it dies until I pull the battery again. Today I had the sudden urge to try fixing it and got different results than I had previously. I cleaned a bunch of lint from the charging port and am now able to get a short red light flash when the phone is plugged in, followed by a vibration, then the battery charging logo, then death once again. Randomly I'll get the cyanogenmod bootup screen when repeating this cycle but for no longer than a second or two before the phone dies again. I've disassembled the phone and cleaned as much dust and crap as possible to no avail. Any recommendations? Could the power button be frozen? My samsung infuse had a stuck power button and would boot loop but my S3 doesn't seem to be boot looping. Just turning on then dying until I fiddle with the power button again.

I want to rule out sudden death...

So, I am fairly new to rooting and flashing roms, but I have done it successfully a few times. This past time, I flashed Cloudy Flex and everything was fine until my messaging was not working. After a quick google search I found a solution that said I needed to purge my internal memory cache and relfash the rom. I took this as wiping my internal memory and I went in to recovery to wipe everything before I flashed. When I got back into recovery, however, my rom was no longer there. I then made the mistake of rebooting my only to find that it can not get passed the LG logo. I also am unable to turn the phone off or enter recovery using the power and volume button. Any advice is helpful as I am stuck. When I attempt to enter either recovery or download mode, the screen remains black and the LED flashes red.

Phone LG G2 d800