Hey I was just surfing and checked this out and here is a cut of what I found:
Accordingly, beryllium oxide (BeO) is not only hazardous, but also found in significant quantity in e-waste items. It is applied as filter in some interface materials (e.g., thermal grease used on heat sinks for computer processing units, CPUs and power transistors), magnetrons, x-ray transparent windows, heat transfer fins in vacuum tubes and glass lasers.
This was copied from here: Recyclability Potentials of Beryllium Oxide from E-waste Items in Nigeria
This is probably only a little head ways but it looks like it is in the "thermal grease" that was used between the heat sinks and processors. Hope that helps clarify a little bit. But I'm sure there might be other uses for it.
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