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Maynard A. Philbrook Jr.

In article , says...

I have a HP Touchsmart 300-1020 computer that has no video and no
audible error code. The PS seems to be providing proper power for much
of the MB, its fans, its DVD, and HD. It has a APP78-CF mother board
that uses an AMD Athlon II x2 4200+ processor in an AM3 socket. I first
searched for some documentation on the processor since there is no heat
being generated by it, and that would mean it was not running. But it
is not available as far as I could find. (Years ago such info was
easily found on smaller processors.) My purpose was to determine where
the clock pulse was and to determine if the processor voltages were
present. I probed the MB and found the core voltages around the
periphery of the socket, so I think the processor is getting the proper
voltages. There is a clock generator chip on the MB (SLG8LP625T) and a
search for the pinouts also came up empty. I did determine it needed
3.3 volts however, and it appears to have it. Probing the clock
generator chip with my scope leads me to believe that the chip is not
running, as there are no active leads on it.

So my question is: Does the clock generator chip free run, or is it
enabled by some lead? Years ago it was free running on older MBs. I do
not intend to try to replace the chip, but I would like to know if it
has what is needed before I give up on the MB.

Check your power switch and circuit ?

Jamie