Not sure if this is the proper place to post this or not, but here goes...

I bought an Osbourne I at VCF West this year, but it has a weird issue where if the keyboard is plugged in, the display will flicker intermittently, as if the CPU is caught in some sort of reset loop. When the display is not flickering (after wiggling the ribbon cable), the keyboard seems to be unresponsive.

Also, the seller mentioned that one of the filter caps blew while he was testing it. Could this have damaged the keyboard somehow?

Any ideas? I've never worked on one of these before (I deal mostly with Macs (68k and PPC) and 486+ PCs), so I don't know where to begin troubleshooting (aside from obvious things like changing out the filter caps).