also if you were overclocking, or just adjusting bios items, and now you lost the link to the video so it is just not running.
you can GUESS , where the defaults are for the bios
or you can resort to the cmos jumper.
after all if you cant do nothing, resetting the bios to defaults cant be worse.
there is a low possibility with those symptoms that it could be other things , just not getting a good post. like say a minor memory problem.
if it is just going off without picture, and still Booting into an OS, it is always helpfull to have more clues for that.
does the hard drive seems like it is still reading stuff.
did the Keyboard lights flash (if you have any)
does the keyboard (if it is set) go into Num lock
did the light on the mouse light up
and my favorite that some people Hate, is the Stupid OS startup SOUNDS. the start windows sound. I always have those on, so if i ever cant see a video, i can still tell if it got to a full boot. And if i got in, then when i shut it down, i also make sure i dont slam it off and corrupt a registry and add to the problems. soooo i got a end sound too.
and dont forget the really lame things to, like making sure you check the video cables are plugged in correct and any multimonitor is on the correct source input.
when having troubles, and finnaly getting it going, we can sometimes forget the most simple things
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