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What would make a 1200XL go straight to RAM test screen?

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Anyone have this happen?  Without fail (i.e. consistently), when I power up this 1200XL it goes straight to the ROM/RAM test.  It runs the test and passes for both ROM and RAM, but I can't get it to boot.  Installation of a cartridge is ignored and still goes to ROM/RAM test.  Also, the L1 and L2 LEDS alternate ON and OFF (someone here has to know what that means).  It can't be a dead keyboard, because it should boot to the ATARI splash screen even if the keyboard isn't installed right?  I can't even get the ATARI splash screen.  Anyone have an open 1200XL they can test this on?  I'd do it myself, but it's not mine yet.  It's in a retro gaming store and I don't want to buy it if the keyboard is toast.  Yes, I can live with the mylar intermittent key continuity (I can remedy that), but not a keyboard that is toast (bad IC).  My guess is that its got to be something else.  Video quality is good, don't know if there is a sound issue and can't get it to run the SALT cartridge (Just ROM/RAM test).  Once the ROM/RAM test is complete, it won't allow me to exit.  Even the RESET key does not work.  Any ideas?

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