Answer to "Installed a second hard drive, why can't the computer detect it?"I have am older macbook pro 5,1 that had similar problems, the drive I put in the optical bay would sometimes be recognized, and sometimes not. Other times it would read in very strange ways. The original optical drive had stopped working, and I noticed the cable was not mating with the receptacle properly. I ordered a cheap replacement cable from gainsaver and voila,everything worked. If you had problems with your drive before replacing it, try replacing the cable if the new drive is not mounting
Answer to "case on the back of the screen is unglued"I had the exact same problem and even took it to an Apple store, which said the cost of fixing it, given it was an older first generation unibody, made no sense. So, I was on my own. Following suggestion I found online, i did the following: 1) Carefully took pix of everywhere there was glue inside the case. 2) Scraped out the old glue and noted its locations. 3) Sanded these locations lightly with high grit paper (600 I think). Vacuumed carefullly. 4) Treated these spots with a weak acid to etch them, I think I used vinegar. 5) Wiped it with rubbing alcohol to clean all residue and aluminum dust. 6) Using the photographs, I carefully applied JB-Weld Liquid Steel Epoxy to the same plces the glue was located, not just gooping it in, but not just putting a few touches of it either. Use the JB-Weld that takes the longest time to cure. (That is the strongest.) 7) Clamped it carefully, just enough to hold together, and make sure you don't let the case skew while clamping. Undue and realign it if needed. Left it...