So tight

Use a very good quality screwdriver and do not use a power screwdriver--that's a good way to destroy the head of the screw.

One thing you can try is to heat the screw a bit using a small clean (i.e. free of solder) electronics type soldering iron. You don't want to get it too hot--maybe 200℉-250℉. A little heat will soften the thread lock compound and make it easier to extract the screw.

Good luck!

Message was edited by: S.U.

First, a longer screwdriver gives you absolutely zero extra torque. Length has no bearing on torque; to get more torque you need a lever arm, like a socket wrench.

Secondly, the key is to apply firm, downward pressure while you turn the screwdriver. This forces the phillips bit down into the screwhead and will prevent stripping.

A drop of WD-40 may help loosen up the screw. Do not spray the lubricant directly onto the screw; it'll get everywhere and make a mess. Instead, use an eyedropper to place exactly one drop on the head of the screw, and let the WD-40 work its way in for a few minutes. Wipe off the screw and try removing it then.

Be very careful that you don't strip the head. I had this happen to me when I was changing out the hard disk in my old Powerbook G4. I had to resort to a power drill to drill out the screws -- not recommended. (The G4 ended up OK, though I'd prefer to keep power tools away from my computers)

Also, like Bill said, make sure you use a Size 0 phillips. I just did the memory swap and one of the screws was also a bit snug. I know if I did not have the correct screwdriver I would have stripped the head for sure. Also, maybe locate a T-handle screwdriver, might give you some leverage. Although, the screws are so short I can't believe you won't be able to twist out with the correct driver and a bit of downward pressure (Just not too much pressure).

i had issues on mine, i didnt have a t handled driver but i was able to grab the little screw driver i was using with pliers to get torque.

i almost stripped the screw out but i managed to get it out before i caused much damage

and i would NOT use wd 40 any where near your computer.

heat is an ok idea but the loctite should not be so bad you cant break the seal with a good screw driver that has some way to get more torque (even a very small t handle will give it)
-matt

are you using a power screwdriver? make sure it is a size 0 phillips head so that it will get a full grip. be wary not to strip the screw entirely.

The screw has thread lock compound on it. So it's harder to loosen than the others.

I was able to remove the screws on my MBP without the use of power tools. THe screws aren't in that tight. You should be able to remove all four of the screws by hand.

No need for power screwdriver. Find a longer screwdriver. You get more torque with a longer screwdriver. Sometimes screwdriver/hex sets have a driver small enough for those screws.

Longer screwdrivers DO NOT give more torque.
It is a commonly held idea but ...
I often need to correct this
misconception in my physics classes.