If it seems like the heat sink will keep your coffee hot, you may have a problem..
I've been working on PCs since '87, and they've evolved a lot (we used to have a 'phantom' PC made out of parts sitting on a static bag. Worked fine, but we found every time we had an actual PC in the service area, some bonehead sales person would sell it to an unsuspecting customer. But even with no case, it worked fine, no real heat problems. Ooops, it was an 80286 tho...
I must confess, I haven't used a static strap since the late 80s...
So far, it hasn't been that much of a problem. A good idea, though, if your shop requires them. Heck, they even gave me a static mat, one time..
One thing; anyone remember a time when they told you the leads off the bottoms of the SIMMS/DIMMs/flavor of the week chips had to be the same color? i.e, don't mix gold-colored and silver-colored pins together on the same system?
If you're getting over a 100 errors on a a memory module, it's time for a new one. Match the capacity and speed for sure (depending on the type of memory you had in there, motherboards will freak if you don't) Memory is pretty cheap now, so it'd be the best solution.