I was browsing on my Mac Pro, then suddenly my cursor turned from an arrow to a hand. I can move it around with the mouse, but I couldn't select anything. ie. other windows. My Mac froze, but the mouse was still working. After a couple of minutes clicking the mouse button to select something, the cursor turned from the hand back to the arrow. But I still couldn't select anything. So I decided to do a hard reboot. This is when I got the grey screen of death. The computer started, chime sounded, grey screen with Apple logo and process wheel came on. The wheel stopped and disappeared at the mark when it normally does. But the screen stayed on the grey with Apple logo. And it just stuck there. So I did another hard reboot. Same thing. But this time I left it alone. After a few minutes, the Apple logo disappeared and it was just the grey screen. Waited a few more minutes, then the arrow cursor appeared, and I was able to move it around. But still the grey screen. Then about a minute later, my scanner started to boot (as it normally does when I startup my computer), but still a grey screen. I've dealt with the grey screen of death before, but it never did this. It seems like my Mac is just responding extremely slow. That gives me the notion that if I left it alone for a couple of hours or so, my desktop and drives will eventually come up. That's just speculation though. And I just powered down my Mac to deal with it later. Does anyone know of this happening? I've never heard of people getting the grey screen, but their mouse works and peripherals startup on a delay. I'll try the troubleshooting for the grey screen when I get home from work. I was just curious about the other things during the startup, as I've never seen or heard of that happening before. Thanks. Update 11-7-15: So I did all the troubleshooting out there, except using Terminal. I can't be quite certain, but it seems to point in this direction. So as I mentioned, it's like my Mac is booting properly, but for some reason it was stuck on the grey screen and logo. I mention this because a couple of times of rebooting, my desktop showed up. But it was ghosted in the backround, and you can still see the a transparent grey screen with the logo. And the mouse was working. I've never come across this before. I booted in recovery mode. Checked drive and permissions. All ok. So I rebooted. And bam! Booted ok. A little sluggish, but it booted. Then I got an error message about TotalSpaces. It wouldn't launch. Yet, it's been working fine for the year that I've been using it. I decided to trash it, and all of it's components. After doing this, my system seems to be ok now. I can reboot with no issues. However, there is another thing that I'm thinking might be a culprit, but not sure (if anyone can confirm, I would greatly appreciated). That's my GPU starting to go. I've never had any issues prior, but apparently my model has a history of it's Radeon 2600XT 256 GPU going south. Can a bad or going bad GPU affect startup? I've also noticed, though can't confirm either, if manually putting my system to sleep (from the Apple Menu) can affect the issue. I put it to sleep this morning and it triggered the issue again when I woke it. Mouse working, but nothing else. So when I rebooted to another drive, that's when I deleted all remnants of TotalSpace from my primary startup drive. I haven't tested the Sleep mode again, as I have work to do. I'll test at a later date to see if it triggers it.