Tried reseating, no luck.
Tried switching the positions of the 2 sticks, no luck.
Tried using each new stick by itself, no luck.
Thinking I somehow got 2 bad sticks (seems unlikely!) I then put my old RAM back in. 3 beeps.
OK, wait a minute. The machine was working fine before. I could understand bad mem sticks, but why won't it work with the old ones back in there.
Even tried each of the old sticks by itself, no luck.
Possibilities I can think of:
* somehow damaged the mobo during installation? (no sign of this, and I was pretty careful w/ both static and physical gentleness
* problem with my primary memory slot - bit of dust in there? shorted out?
* random coincidence, mobo picked this moment to die on me
What other causes am I not thinking of?
I will go try to blow out the mem slots in case dust is the problem, but in case that doesn't work (and I'm not too confident) I would appreciate any other suggestions.
Maybe attempt a manual bios reset. Your manual should give you steps on how to do it. Usually removing the MB battery and switching a jumper or so. Might help, especially if you had any overclocking of the previous RAM.
Thanks, and I feel like an idiot, but I figured out what it was. The sticks simply weren't seated quite all the way. I thought I had them in there, as the clips were mostly closing, but I figured out that I really needed to shove them in there to get them to seat all the way. Only could see that when I shined a really bright light into the case.
I installed some RAM in my laptop today, and that took maybe 1/3 the force to seat as these did.