Is it advisable to tie up loose cables?
No tidy loops is fine., It stops then getting sharp bends that for signal/audio-video cables can give poor performance for Mains cables – give hotspots/fire hazzards BUT do seperate the mains cables from the Audio-Video ones. 2 groups, to prevent interference from the high power noisy mains ones getting onto the lower level signals of the Audio (some million times smaller !) and Video (some 100 times smaller) With the power of TV/Video you are not likely to get heating problems. There is not enough current (1-2 amps not 5 to 10), even if it was high, a loop of 3 or 4 turns is fine, 10-20 loops of an extension cord is a problem Its the number of loops concentrated in one place that causes the heating/lack of cooling problem.