JB phone won't enter DFU. Isn't recognized by Tiny Umbrella or iTunes. Help!?!

hey guys, several year lurker first time poster. i've got problem i've never come across before. have iphone 4 on 5.01 jailbroken absinth 0.4. today randomly turned off while using app. couldn't on figured wait until got home , put in dfu , reinstall os , rejailbreak (which i've done many times before). but...the phone won't go dfu. it's not recognized tinyumbrella have old shsh stored nor recognized itunes. i've googled hours , can't find help. ideas? battery charged way , made sure usb port working on mac. help.

forgot mention, there's absolutely nothing happening on iphone screen.

 

have tried hard reset, restart computer, tried computer?

 

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