my macbook throws up a kernel panic every time i try to boot the os or a bootale usb with a mac os install disc on it. the weird thing is that i was able to boot a usb with memtest on it so i pretty much took that as it can boot something on a usb. what do you all think could be the cause of this cause it’s stumping me. i don’t know what os version is on it currently as i bought it in non working condition to try and repair it