I have a macbook pro 8,1 that is having issues starting up. When I first turn it on, there is a small grey loading bar beneath the apple logo and loading circle. After the loading bar is ~20% done, it disappears. After this, the apple logo remains, and the loading circle continues spinning, but it stays like this for over an hour, until I eventually have to force shut it down.
I cannot boot into safe mode, but I can open up Apple Hardware Test, which after multiple passes has not found any issues (both regular and extended tests)
The DVD drive has had a disk stuck inside of it that cannot be removed, so I can't try to boot off a disk (even if I had one).
Best Answer
There are 2 trouble shooting methods if the Safe mode fails.
But before you go in to them, try the PRAM reset.
If that did not help move to the start up in Verbose mode (hold v during start up).
Once you have identified the source (where verbose mode stops processing), move on to the Single user mode([command]+[S]).
WARRING...if you do not know what you doing in this mode do not do it.
Now... the next step will depend on the cause identified in the Verbose mode.