Cannot switch video cards

Searching as best I could, the only relevant question I could find was this: http://discussions.apple.com/thread.jspa?threadID=1823910&start=0&tstart=0
My problem, however, is slightly different. On the Energy Saver pane, I have the choice between 'Better battery life' and 'Higher performance'. And I can click the latter, at which point a dialogue comes down saying "Please log out for this change to take effect." I do so. When logged back in, however, I open System Preferences again, look at the Energy Saver pane, and although the "Higher performance" box is checked, it says next to it "You need to log out for this change to take effect". However many times I log in or out and check the box, that always happens. And the Systems Profiler shows only the "NVIDIA GeForce 9400M" (in the "Graphics/Displays" section"), when I believe the correct card should be "9600M GT". In fact, I thought that both cards should show up all the time.
Any ideas?

Rebooting I have tried (no difference to logging out). But I had never heard of the Apple Hardware Test - thanks for that, I'll hunt down the install disks and try that tomorrow morning.

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Cannot Detect Video card (Radeon 6750m)

Dear sir,
I would like to know why my laptop cannot detect my video card (Radeon 6750m). It only shows the built in graphic card intel. I already try to use system restore and reset to original factory mode. It will appear but after updating my drivers and reboot my laptop. My laptop cannot detect again the video card.
Please help me resolve this problem,
for you reference
http://tinypic.com/r/2it67ex/8
This question was solved.
View Solution.

You will have to enable the Radeon HD adapter by using the Catalyst Control Center.
Once you do that the adapter will appear in the Device manager.
If you are using the Intel HD graphics, only the Intel graphics will be seen in the Device Manager.
I know that may sound strange, but it is one of the pecularities of having a switchable graphics capable notebook.
The following URL goes to an overview of switchable graphics. Take a few minutes and read it. It should help make understanding it simpler.
http://support.hp.com/us-en/product/HP-Pavilion-dv4-Entertainment-Notebook-PC-series/5048648/model/5...
Do not instal the Intel graphics driver seperately!
Doing that breaks the switchable graphics feature.
Only install the HP ADM ATI graphics softpaq. It will install both drivers automatically and let you use the switchable graphics featrure og your notebook.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

When to switch video card?

Quick question. I've just bought a MBP 2.4 late 2008 with the dual video chips.
I spend most of my days in Word, Excel, Visio/Omnigraffle etc. and don't play games. I tend to run Windows in Parallels or VMW depending on the app I need.
Given this, I assume then there's little benefit to me switching to the higher performance card other than helping to keep my hands warm?
Thanks

Hi Stefan:
A question for you: I have a brand new Macbook Pro (late 2008 model). For some reason, when I have it set to the higher performance video card, certain websites that seem to use a lot of Flash, have problems displaying (the screen flashes randomly in a "building block" fashion), but when I change to the lower performance card the problems disappear. Is this normal, is it some sort of defect and is there anything I can do (firmware update, etc), to fix it?
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http://support.apple.com/kb/HT3964
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Initially I had the screen going black with a few pixel white line on the top left part of the screen during the hot months of the summer, and I though it was just a little glich due to temperatures and due to connecting or disconnecting the power supply. But in the last couple of days, it has happen everytime, I connected/disconnected the power supply. I do not think the power supply is at fault, but as I connect or disconnet the PS it forces a graphic card switch and it goes black.
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Hello and welcome..
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Make sure there's enough space...
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Cannot switch video cards

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