Server pure wont boot

i updated my server pure and it wont reboot or connect to the internet. at one point i could plug a monitor directly into the back of it and it showed a sceen with 4 tabs on it one read default reboot and there were a few other options but no way to click on it. i tried plugging in a mouse and it didnt work. how do i get it to reboot. i left it plugged in over night and still nothing. I cant even find it anywhere on my network now. the ethernet cable has both the lights on it on but not blinking at all.