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Strange AGP Display problem

Trish's Escape from Hardware Hell Help Board » Hardware » Video Related Problems » Strange AGP Display problem « Previous Next »

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Wayne Lewis
Posted on Tuesday, February 3, 2004 - 4:59 pm:   

I just put an AGP card (nVidia Riva TNT2 M/64 32MB) in a new motherbaord. After a BIOS update I noticed that as soon as the desktop in 98 loads ( after I enter the logon password), the display will blank for a fraction of a second, and does this 3 times during a period of 30 seconds then runs fine. The motherbard manufacturer (Chaintech) had me install an updated AGP 3.0 driver, but it did not fix the problem. They told me that this is a common symptom on some boards and there is no fix for it.

Also I tried 3 different driver versions for this board, but I don't reacall it doing this before the BIOS update (which it had to have to recognize the processor.)

Has anyone seen this symptom on their systems, or have any ideas?
Moderator (Es)
Username: Es

Registered: 6-2003
Posted on Tuesday, February 3, 2004 - 8:54 pm:   

Hi Wayne,
I have seen this a few times on nvidia based cards where the sync and refresh rates between the monitor and vid card cause vertical blanking. Some systems flicker a bit while others with some what older and slower circuitry will actually black out (I.E. mechanical relays instead of faster solid state switches). It is normal. A common fix with most is to set the AGP cards refresh rate to the monitors default refresh rate for the desired resolution, unfortunatly that might be 60hz. Adjust the refresh rate after windows is loaded than perhaps it won't take 30 seconds to sync up.
Wayne Lewis
Posted on Tuesday, February 3, 2004 - 9:52 pm:   

That's might be it. I tried all the refresh rates and it does it to some extent on all, but at 72Hz it is less noticable. When set as low as 60Hz and high as 85 it is more noticable. I also tried different resolutions... the same thing.

The monitor is an older CTX-1562GM multisync/multiscan H Freq: 30-62Khz, V Freq:50-90Hz -- composite sync.

Prior to putting it on this board, I tried it on another using the same monitor, and do not recall it acting that way then.

Wayne Lewis
Posted on Tuesday, February 3, 2004 - 10:56 pm:   

I just tried something else. I found the original driver disk that came with this card. It is MUCH older than the other 3 versions I tried, but it seems to have fixed the problem.

I also think it was the same driver that I used to test the card on the other board that didn't have these symptoms.

Strange -- the oldest driver works the best.

Moderator (Es)
Username: Es

Registered: 6-2003
Posted on Wednesday, February 4, 2004 - 11:02 pm:   

CTX-1562GM would be an older mechanical switch type monitor for sure.
Posted on Tuesday, February 10, 2004 - 10:58 pm:   

help my computer is so messed up. i have been trying to figure it out for weeks now i cannot even boot up or get my monitor to turn on only an orange light help please help

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