Because He-Man needs a new rig. Superheroes need new computers too.That dinky sword just isn't gonna cut it when he gets online for his daily World of Warcraft fix.
At the time they couldn't come up with better names using man (e.g. Superman, Spiderman, etc were all taken). Had XPower been available at the time, we would have had X-Man. Oh wait.
He-Man would've been better off with XPower because maybe, just maybe, a computer could figure out were Skeletor's hideout was using GPS imagery. I mean come on, it looks like a giant freaking snake. You would think they would just storm Snake Mountain, kick some ass, and there you go end of the fucking series. (Disclaimor - Actually they knew where it was because they had to rescue Teela once, also I LOVED He-Man as a kid, along with all the other action cartoons of the 80's, and my daughter, 5, loves it now)
With an XPower motherboard by MSI, He-man would never again need to hide his collection of polaroids of Teela from Orko by stuffing them down his codpiece.
The XPower would have given him the e-penis lift he needed to finally look good enough in his speedos to bang all the girls in Castle Grayskull and out bone skeletor
He-Man being the strongest in the universe requires a strong computer to prove his abilites in all realms of the universe. The XPower will provide him unmatched abilities in the virtual universe.