英文字詞意思一問

Only six out of ten computers at school worked. He never knew which one until he sat down and searched for a flicker of files on the screen.
A flicker of files === There were so many files on the PC.

As he scrolled it up and down for the information, the information on the screen was like flickering.
That's what I think it would mean.

886

"... only six of the school's 10 computers worked. He never knew which ones until he sat down and search for a flicker of file on the screen." a flicker of file 是指甚麼意思 ???
Here, a flicker of file, means : a number of unstable files.
Flicker (verb) = 閃爍;搖曳;忽隱忽現 or 不穩定.
他查閱了很多不穩定的文件後才能確定那幾部pc還能運作.