If you buy the ifixit suction cups (as I did), here's a tip. After removing the white paper cover stuck to each one, AND BEFORE putting them on your glass as shown, CLEAN them with a vinegar/water solution or glass/window cleaner. Because if you don't, they will leave ugly circles on your glass that will take quite a bit of effort to remove with said vinegar/water solution or glass cleaner. Other comments helped me with my power supply replacement, so I thought I would leave this one for the future. Thanks for a great guide.