It happened to me again. topic

I dont know what is wrong with my X8. It's manufacture date is 10w51. I unlocked it's bootloader succesfully and flash naa 14 then I flashed denelshin 7.04 rom. I am playing Hill Climb Racing when it suddenly hangs so I turn it off. I turn it on but it just vibrates and doesnt boot up. This happened to me twice before. First, I tried to change the battery and it works. Second, when it happened again I tried to flash with different USB cable and it works. Now, I tried to flash using different cable but it doesnt work anymore. I can see the Green Led when I connect it to the PC via flash mode. What could be the problem? Please help. Thanks guys!