Default coma brick samsung tab 2 please help

Hi all, after installing a custom rom and leaving the tablet in bootloaded, it turned off. Now i cannot get it to come back out, when i plug it into the mains to power it up, i got a battery sign with a waiting symbol in middle. If i try to get into bootloader just turns off without going into it. If i unplug it then does not turn back on. anyone got some ideas how to get the bootloader
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