Boots with battery disconnected on second Power button press but...not from battery when connected. At boot without battery, MagSafe shows green for two seconds and then orange constant....
Answer to "How exactly to fix a stain behind an apple thunderbolt display?"It’s heat related; switch off the screen overnight and the stain is pretty much gone. Let the screen run for a few hours and the stain is back. You can mask it by setting the desktop to black. Improving the internal fan capacity to vent more heat will reduce the incidence.
Answer to "Purchased Hard Drive Cable fails after 2 mouth of use."I purchased a 2011 MBP hard drive cable from iFixit last week and it came in a mangled and badly folded condition with a severe permanent crease in the signal lines and no paper backing on the sticky parts. An email with pictures and an international telephone call to iFixit support said this sometimes happens (!) but there was no offer to replace what is clearly a defectively packed part. There was mention that if it works but fails in the future they will replace under the lifetime warranty policy, so I'm faced with installing a substandard part and waiting for a second failure. I am VERY disappointed with the service from this company and WOULD NOT purchase from them again.