External Display flashes when attached via DVI to MBP

When I attach the Samsung Syncmaster 204B to my MBP running 10.5.4, the external screen appears for about 5 mins and then it randomly flashes off and on. The only property that can be adjusted form the MBP is the resolution. Does anyone have any hints on how to fix it?

Hey there,
I'm having the same problem and I "May" have a solution. Mine is the Syncmaster 2493. Brought it home last night, set it up, basked in it's glory and then phrrrt....it goes bright and turns off. Over and over. Anyway, by searching the forums here, a rep mentioned there were problems with the "Autosource" feature in the monitor menu itself.
So if you go into the monitor menu, using the buttons on the monitor, and scroll until you get to the Autosource feature, then toggle it to Manual.
I did this and it worked great.....at least last night it did. This morning it's still sort of happening but that was after I made the monitor a bit brighter. Anyway, see if this works for you.

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Hi there,
I have an external display (Samsung 920nw) used as an extension of my desktop. When I go to sleep so does my Macbook... I close the lid and the computer goes to sleep mode within seconds (the white led on the front right slowly flashes confirming that the computer got to sleep).
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I am not sure but I believe that sometime during the night the Macbook wakes up and he thinks that I am using the external display as the only display.
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I have a bluetooth mouse and a usb hub with printer, pen drive, external hard drive attached to the macbook.
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Could be caused by a backup drive or some other application running in the background. There's no way to be sure without looking at your crash logs. I keep my computer on but I always close down my apps at night to protect them from power outages.
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Message was edited by: CyrilW

According to Apple with an external monitor connected only the nvidia card is used. So it's not changing graphics cards. I would think it's more a driver issue or the usual blinking screen fault of nvidia (timing issue). Send in a report to Apple describing the fault.
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Message was edited by: pepparkaka

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Follow these documents.
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http://support.apple.com/kb/TS1440
http://support.apple.com/kb/HT1455
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/HT1379
http://support.apple.com/kb/ht1379
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Hello, Murali Muthyalu.
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External Display flashes when attached via DVI to MBP

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