Default Htc one massive problem

got my htc one today from who i thought was a nice lady, turned out to be a ....yeah...that, she showed me it working but as soon as it went dead, it never came back on, turns out the phones bricked i think
it was on a tablet custom rom, as im trying to flash the stock rom but im not very good at doing this, i cant find a working recovery that allows me to mount system as it cant have a memory card, no success, i can only get into bootloader fastboot thingy and use the cmd adb thingy,
also i cant boot the phone up as normal, i tried earlier but it satys on the htc screen, the fist screen when u switch it on my device details are as follows
HBOOT - 1.54.0000
RADIO - 4A.17.3250.14
OPENDSP V31.120.274.0617
OS -
EMMC - BOOT 2048
somebody help me please im dieing without a good phone lol