How to turn my jailbroken iPhone back on?

I searched this alot but none of the situations are the same as mine. My phone blacked out even though it was on 85% but it as still recieving calls & playing music. I let it go dead & tried to turn it on while it was charging but it buzzed twice & thats it. I tried restoring it but i can't since i had a password on it and the screen is completely black. I tried putting it in recovery mode but like i said, the screen is black. Not even the logo is coming on.

Plug it in to iTunes and erase all memory not restore there's somthing you can do that even with a lock will delete everything once you do that put your most recent backup on it and jailbreak again with evasion

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