Mac to VGA Monitor adapter settings needed

I recently moved the system to another location and the dip settings were inadvertently changed in the process.
I had them written down, but I lost them in the move.
Anyone know the settings or how to find them?
I'm using a GEM model DE770 FA monitor. The system worked really good running MAC OS9.2 with an upgrade to G4 and the Radeon 64 MB video card. I went out and bought another adapter that came with some settings, but I have tried them all to no avail. Maybe I'm not checking them correctly? Do I have to power down the machine each time I disconnect the cable and change the settings, connect and restart the machine for it to recognize a signal?
Any help on this is appreciated.
BW G3   Mac OS 9.2.x   Upgraded to G4 w/ Radeon 64 MB video card

Thanks Jim,
I tried to zap PRAM, but the chime came right away after I pressed the power button, and I held the keys down until after the chime, and it chimed again...is this normal?
ponomo1997,
"Do I have to power down the machine each time I
disconnect the cable and change the settings, connect
and restart the machine for it to recognize a
signal?"
Yes.
Older computers with onboard video and a nubus
videocard and OS 7.1 would let you set one monitor as
your start up monitor and have BOTH control panels on
your startup monitor. That allowed you to see the
controls and frequency of the other monitor while you
changed settings.
I miss that feature. Now, as part of the startup
routine, the computer will auto detect the frequency
of the monitor connected and reset the monitor. A
second PCI video card would allow you the option to
start up with one monitor and test settings on the
other.
One suggestion would be to find a monitor that is NOT
multi-sync and test that. Also, consider zapping the
video parameters at startup. If the monitor is multi
sync and looking to see what frequency the computer
is set at and the computer is looking at the monitor
to see what frequency it is set at, you end up with
confusion. That is where you are at. Start up while
holding down the command + option + P + R keys. Wait
for a chime and then release.
One of my Beige G3s has to have the video PRAM reset
to the default of 640 x 480 in order for it to start
up properly with a new monitor. Once it is up and
running, I can change the frequency (pixle
resolution) using the control panel.
Good luck chancing onto the right setting for that
adapter. I take it that the new adapter did not work
either, notwithstanding the availability of the
instructions.
Ji˜m

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