A mobo that supported a 120 may not support a 550.  Try removing the CPU to see if you get a bunch of beeps with the POST screen. If you don't like that, put your 120 back to see if it works with that.

>Hi all,
>I recently upgraded my old Pentium 120 to the SOYO 5EH5 MB with an AMD550
>due to several suggestions off this list. Suddenly I get no post. All fans
>spin, HD spins up but no post beep or video signal. Is it possible that a
>dead CMOS battery could cause this? Is there a way to determine if its the
>battery, CPU or MB without replacing parts? A battery is easy enough and no
>$$ to speak of, but I can't see replacing either the MB or CPU just to
>determine which is the bad component. This also could be my first venture
>into RMS's and the like :(
>



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