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whymewhynot
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June 16th, 2005 23:00
Boot Sequence
Am I correct in that during the boot sequence the onboard vga controller ( motherboard) handles the graphics whilst windows loads, at the end of the xp logo loading screen the graphics is handed over to the video card ( in this case a 9700 ATI fitted to a 9100 inspiron).
If the above is true then any corruption of the screen on boot, ( corrupt bios loading screen, flashing bands on the xp load screen, tears on the xp load screen, would all be attributed to the onboard vga chips.
If all the above is true, what process does resuming out of st-by involve ? Using onboard vga until driver re-established ?
Also is this function controlled by the intel chipset drivers ?
Still trying to work out why lappy will not resume from st-by, now has flashing purple bands across the screen and the keyboard is frozen.
Thanks
whymewhynot
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Posted June 17th, 2005 16:00
Ok it appears you are right, at least for booting from cold. I spent quite a while looking but eventually found out that pretty much first job on the Bios mind after doing the post is to locate the video cards bios and run it . This boots the card into vga mode and later on the driver is loaded .
So the corruption I am having could very well be a bios fault on the video card ?
Just have to research what happens from a st-by situation
funtoupgrade
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Posted June 17th, 2005 16:00
Or a bad video card. Does it display same symptoms with an external monitor attached?
whymewhynot
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Posted June 17th, 2005 17:00
Havn't got an external monitor I can hook up to just now but as the lappy is frozen at the same time ( will only respond to a hard boot) I get the feeling it is not screen related.
Very pretty purple patterns !! I ahve a vid captured with my camera of it but no way to post it at the moment, so when I find a website that will let me uplaod it I can link it here
whymewhynot
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Posted June 19th, 2005 03:00
ATI quickly determined it was a bad bios chip so now I just have to convince Dell
funtoupgrade
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Posted June 17th, 2005 15:00
I am not familiar with your model, but pretty sure you are not correct. If you remove the video card then the thing will not boot period on the models I am familiar with. Pretty sure the video card handles the boot and then the driver takes over for windows. Best way to put some blame on video card (or video cable or motherboard) is to hook up external monitor and see if problems show up there also.