Andy, this sounds more like the power connection between the power
supply and the motherboard is loose. Each of the devices you mention
gets power through a separate cable and can mechanically operate
regardless of the motherboard status. If the motherboard is not
getting power, the onboard video will not be powered, therefore
leaving "no signal" from the video board.
One thing to check is to see if any of the devices receiving power
from the motherboard directly rather than from the power supply are
functioning. One of the common items is the CPU fan. Is the CPU
cooling fan operating? If not, there is a chance the connector
supplying power to the motherboard is loose or disconnected. On older
machines, this is actually two connectors, but on most later ones, it
is known as an ATX connector and is all in one connector. Make sure it
is latched down with the clip on the side. Make sure none of the pins
on the motherboard did not become unsoldered or broken loose from the
motherboard from the shock of the fall (or the sudden stop at the
bottom of the fall).

John - KE5HAM

--- In digitalradio@yahoogroups.com, "Andy obrien" <k3uka...@...> wrote:
>
> Hmmm, I switched monitors and monitor cables to ones that are known to
> be working...NO signal to the monitor at all.  The monitor is working,
> just no signal.  The PC turns on, the CD ROM drive opens and closes
> upon pressing the button , so something on the PC is working.  Since
> the video is on the motherboard I am not sure if there is anything to
> poke and prod, nothing obvious anyway.  I wiggled the monitor
> connector to no avail.
> 
> Maybe I'll pick up a cheap video grahics card and see if that will
> work, knowing my luck it may not work until I get inside the BIOS and
> switch from the onboard video to PCI card.  I'd be really stuck then.
> Mayne I'll remove the HD and stick in another PC.
> 
> Andy K3UK
> 
> 
> On Mon, Dec 22, 2008 at 10:44 AM, Andy obrien <k3uka...@...> wrote:
> > Thanks for the suggestions, I suspect a monitor related issue.  I just
> > put in a Linux boot disk (FL-Digi) and I do not even get a signal to
> > the monitor, nothing displayed at all, same when i try to boot the HD
> > with Windows XP. .  The video is on the motherboard so there is no
> > video CARD to reseat.  I'm going to switch video cables and see if it
> > is a cable issue.
> >
> > Andy K3UK
> >
> >
> >
> > On Mon, Dec 22, 2008 at 7:16 AM, Andrew <es...@...> wrote:
> >> Andy,
> >>
> >> I would suggest reseating (thats seat not set!) all the cards,
> >> especially the memory chips. Had that one before myself.
> >>
> >> If that fails I would guess the HD might has taken the knock.
> >>
> >> Andrew
> >> LY/ES2DY
> >>
> >> --- In digitalradio@yahoogroups.com, "Andrew O'Brien" <k3ukandy@>
> >> wrote:
> >>
> >>>
> >>> Please excuse the non-radio question...
> >>>
> >>> We have a PC that just stopped working, looking for some possible
> >>> ideas. The PC (a desk top) was knocked over by a frustrated
> >> teenager
> >>> , when plugged back in the power light comes back on but nothing is
> >>> seen by the monitor , no Windows attempting to boot or anything, no
> >>> beep codes. The fans are going, I do not see the HD LED light up,
> >>> and after a few seconds at boot-up, I hear a slight click like the
> >> HD
> >>> is trying without success. If the HD has gone kaput, would I not
> >> get
> >>> some indication from the PC rather than just nothing at all ?
> >>>
> >>> Andy K3UK
> >>>
> >>
> >> 
> >
>


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