[Q] stuck at "dual core" but now can't even fastboot?!

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I bought one of the refurb'd bionic's a couple months ago. I've rooted and masked the wifi tether, but nothing else, no custom ROMs or anything. phone's been working great for the past seveal weeks since those changes were made, several reboots, etc. no problems until last weekend.

I randomly found my phone stuck on the "dual core" screen one morning. it must have rebooted overnight and been that way for several hours as it was quite hot. I did a battery pull and tried to turn it back on, got nothing. plug it in to the charger, nothing, no leds, nothing. several battery pulls later, still nothing. try to enter fastboot/bootloader by pressing power + volume up/done, nothing. plug it into the computer, nothing.

I'm sorta fearing its been hard bricked (though I have no idea why... i wasn't loading ROMs), except, the other day, after leaving the battery out all night, I was able to get it to turn on, it booted up to the home screen, but before it was usable, rebooted and was stuck on "dual core" again. messing with it some more, I eventually got to the bootloader screen. I wish I had siezed that moment, but i didn't. Messed with it some more yesterday, saw the 'dual core' screen again, but couldn't get it into fastboot. its very hit or miss and I can't do it consistantly, but on rare occasion, it does seem to want to come back to life.

any advice on what happened? where to go from here? and if it can get it back into fastboot? I'm hoping i can and rsdlite will recognize it and I'll try loading 902 fxz back on it, but sure could use some advice to save this phone... no insurance and it was a refurb thats been rooted, I don't think verizon will be too much help.

THanks
-Rob

Try this

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Little known hidden key (actually button) sequence: press and hold both volume up & down then hold the power button ten seconds (five should work, but ten always gets it). You should boot into fastboot mode, then flash 902 using a USB cable. You do NOT need to delete data! Check the batch file and REM out or remove any line that says it will. Worst case, Motofail after that will give you access to your latest CWM backup, assuming you have one, just restore that once you have root.

What he said and also you may need to charge your battery.

Sent from my DROID BIONIC using Tapatalk 2

It could just be a dying phone, I came across an Atrix basically in the same situation. The radio in it had died, so the only way to boot the phone was to skip booting the radio, but if you hit the phone application it would crash the phone.