ITMS 8.x
Make sure that when you open the .CSV file it shows the list of computers listing down in a column with no commas or other markings anywhere in the list as shown in the example below:
Computer1
Computer2
Computer3
Computer4
Computer5
Computer6
Computer7
Computer8
Computer9
Many times this behavior happens if the file originated as a .XLS file. When saving a file that has additional settings you need to make sure to answer no when prompted to keep the formatting. This will allow the file to save correctly.
An alternate method to fixing the formatting issue would be to copy and paste the list of computers into Notepad and then save this as a .CSV file type.
NOTE: When importing a .CSV file for a collection, it will only add computers that are currently in the database; so be aware that you cannot populate a collection with computers that have not yet been discovered.