New
#11
I don't suggest that you use cable ties. Instead, I recommend some 2 sided velcro strips instead.
Amazon.com: Velcro Reusable Self-Gripping Cable Ties, 0.5 Inches x 8 Inches Long, Black, 100 Ties per Pack (91140): Office Products
With these, you can take them off, add more wires and put them right back on. This way you aren't poking around inside or the computer with a pair of scissors.