[Ti] video ram

[Kynan Shook]

Thor, there is no such thing as resetting VRAM.  You can reset the PMU 
(Power Management Unit, which is in control of all sorts of crazy 
little things besides just turning on and off your computer - it's 
quite literally a miniature computer inside your computer, and can 
crash separately from your computer), and you can reset open firmware.  
Lisbeth described the way to do open firmware.  To reset the PMU, first 
shut down your computer.  There is a little button on the Titanium 
PowerBooks to press, while on the Aluminum PowerBooks you use a key 
combo.  Except for the most recent 1.5/1.67 GHz models, press 
Shift-Control-Option-Power.  The newest models require you to remove AC 
and battery, then hold down the power button for 5 seconds.  In the 
early Ti models, the button is on the back between the external video 
and the modem ports.  In the later TI models, the button is under the 
keyboard, near the power button.

More details (including some photos) are here:
http://docs.info.apple.com/article.html?artnum=14449

VRAM, or Video RAM, loses its entire contents each time you reboot or 
shut down your computer.  For this reason, there is no such thing as 
"resetting" it.  NVRAM, or Non-Volatile RAM, is designed to hold its 
contents even if the computer has no power for a long period of time.  
If it gets corrupted, it is sometimes necessary to reset it, as 
documented.

HTH,

thor <thorthor at altern.org> writes:
> Thanks Lisbeth!
>
> I started up in Open Firmware but it does not recognise "reset-vram"
> it says:
> unknown command reset
>
> But it does recognise "reset-nvram"
> and "reset-all"
>
> none of these help.
>
> I think NVRAM and VRAM is not the same, so I'm still looking for
> the way to reset the video ram.
>
> Any further ideas, somebody?