I'm having the same issue. Except my computer randomly locks up, its always done this though.
If I don't shutdown Yosemite properly I have to plug in USB HD and boot with -X. Then restart and it works fine as normal..
I don't get it.
I have some type of hardware issue (video card I think) where my system will lock up. It's random, sometimes once a day other times once a month. doesnt matter if it's running windows or OS X.
since upgrading to Yosemite it won't boot up if my system crashes (Mavericks and chimera it would...
I took the plunge and just did this today. Download Clover. Install. Reboot. Done. I didn't have to do anything else. Didn't copy any ktexts, nada. It just works.. Magic.
iMessage took me a while to figure out all the MLB ROM UUID stuff. Had a few screw ups, had to boot off the USB disk with...
Just upgraded to Yosemite. Everything work fine when I boot with -f.
When I boot in -v. I get VoodooPS2Mouse Version 1.8.11 loaded... Still waiting on root device..
It won't go past that point.
When I add flag -f everything works fine.