customer's computer had a problem ...unfortunately..i can't fix it ...,he wants to install sound card but he had screwed the CPU...i can't figure out ..monitor didn't show the view

spec
Intel Pentium 133 (if i'm not mistaken)
RAM 64 Mb
HDD 1 Gig (Seagate Quantum)

in my head ..the problem is MoBo ...because the display is in good condition...

p/s why huh?!!