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In general, they're very different movies, but both of them share the striking fact that you don't hear a single bit of spoken dialogue until ~15+ minutes into the movie.

When WALL-E restarts the sound is the one from the Mac boot.

Because space.

From http://2001.wikia.com/wiki/HAL_9000 :

In the 2008 Pixar animated film WALL-E, the starship Axiom's Autopilot ("Auto"), which is also the main villain of the film, has a glowing red camera, a low electronic voice and a hidden directive - deliberately reminiscent of HAL. WALL-E's pet cockroach is also named Hal, but it is also a reference to Hal Roach.