I have an iMac and a MacBook running Snow Leopard.
I used to connect from my MacBook to my iMac regularly with screen sharing. Has worked great for over a year.
I recently got my hard drive in my iMac upgraded (from 250GB to 1TB), as far as I know the technician somehow "cloned" the drive, but I really have no idea what the process is. All I know is the iMac works exactly as it did before, it now has a bigger drive, except that screen sharing no longer works.
There were two "admin" accounts on the iMac. "rob" and "user" (user was created by the technician during the hard drive upgrade.
When I connect via screen sharing with "rob/correctpassword" it says something like "connect failure, can't verify password". As a work around I would try "user/blankpassword", same error, then try again with "rob/correctpassword" and it would work. I had to do this same thing every time to connect. Rob-fail, User-fail, Rob-success.
Eventually I deleted the "user" account because I never used it, and now I can never connect as "rob". Screen sharing is on, and like I said, this always worked before, but there's an authentication error every time.
Does anyone have ideas what's wrong, or suggestions for how to fix this?