Deleting ghost files
I bought a new iMac with a much larger hard drive than my old model. This meant I could bring all my music, photos and videos from their external hard drive and into the new iMac.
The iMac crashed about 70% of the way through the first transfer attempt, but was successful on the second.
Everything is now singing happily, except I have been left with a huge number of grayed-out ghost files on the iMac from the failed attempt. I can't delete them and it looks untidy.
Can anyone advise me how I should get rid of them?
iMac (27-inch, Late 2013), OS X Yosemite (10.10.3)