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External monitor wont work after windows boots up

Last response: in Windows 7
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January 24, 2013 8:51:02 PM

Hello, I have a Lenovo u400 laptop and im trying to connect my external samsung syncmaster bx2335 to it through an hdmi/dvi adapter.

When it first boots up, the monitor works displaying the lenovo logo but when it gets past the windows logo and onto the log in screen, it switches back to the laptop and the monitor wont respond anymore.

I have uninstalled the video drivers and that make the monitor work when windows was on, but once i tried to reinstall the drivers the problem came back.

and yes, i've tried the fn+f10 switch for the monitor. nothing has worked.

any help?
a b C Monitor
a b $ Windows 7
January 24, 2013 8:55:52 PM

Check your function keys on the keyboard - there should be a FN key, when pressed with another key (maybe LCD? or picture of monitor?) will allow you to change displays. (from the picture I am looking at - FN + the key over the "6"?)
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January 24, 2013 8:57:35 PM

ronintexas said:
Check your function keys on the keyboard - there should be a FN key, when pressed with another key (maybe LCD? or picture of monitor?) will allow you to change displays. (from the picture I am looking at - FN + the key over the "6"?)


Yes, i've tried that. Sorry i edited last minute, i forgot to include that. :) 
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Related resources
a b C Monitor
a b $ Windows 7
January 24, 2013 9:08:56 PM

When you right click on the desktop, and go to personalize, and display settings, do you see both the LCD panel and external monitor on the settings screen?
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January 24, 2013 9:38:02 PM

ronintexas said:
When you right click on the desktop, and go to personalize, and display settings, do you see both the LCD panel and external monitor on the settings screen?


i only get 1. mobile pc display 2. display device on vga

under devise manager>display adapters i get Intel HD graphics 3000 and Standard VGA Graphics adapter. but the vga adapter has a yellow exclamation point and the device status is: This device cannot start. (Code 10)
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a b $ Windows 7
January 24, 2013 10:49:58 PM

vic1562 said:
i only get 1. mobile pc display 2. display device on vga

under devise manager>display adapters i get Intel HD graphics 3000 and Standard VGA Graphics adapter. but the vga adapter has a yellow exclamation point and the device status is: This device cannot start. (Code 10)


That means you don't have the correct graphics driver, hence not being able to get video on the external.

I'm going to assume this is the Lenovo IdeaPad u400 which actually has an AMD chipset and not Intel.

You can get the drivers HERE .
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January 24, 2013 11:34:21 PM

hedwar2011 said:
That means you don't have the correct graphics driver, hence not being able to get video on the external.

I'm going to assume this is the Lenovo IdeaPad u400 which actually has an AMD chipset and not Intel.

You can get the drivers HERE .


I installed the drivers and the monitor still wont respond when i switch to extend under connect to projector.
The laptop does detect the monitor though.
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a b $ Windows 7
January 25, 2013 2:24:03 AM

vic1562 said:
I installed the drivers and the monitor still wont respond when i switch to extend under connect to projector.
The laptop does detect the monitor though.


Follow this path:
Control Panel\Appearance and Personalization\Display\Screen Resolution

When you get there, are both the LCD and the external listed there?

If so, when you installed the AMD drivers it should have installed Catalyst Control Center. If it didn't, I recommend installing that as well as it gives you more free control over the display options.

Info on getting the settings correct can be found HERE .
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January 25, 2013 5:31:09 AM

hedwar2011 said:
Follow this path:
Control Panel\Appearance and Personalization\Display\Screen Resolution

When you get there, are both the LCD and the external listed there?

If so, when you installed the AMD drivers it should have installed Catalyst Control Center. If it didn't, I recommend installing that as well as it gives you more free control over the display options.

Info on getting the settings correct can be found HERE .


It doesnt say that there is an external monitor all it says is: Display device on VGA and Display device on Composite. i've tried both but neither worked.

Every time i disable my video card/uninstall the drivers, the external monitor responds and i'm able to use it. but as soon as i reinstall those drivers it will no longer work. are there any older drivers?

Also, this laptop has two Video adapters. An AMD radeon HD 6470m and an Intel HD graphics Family. is there a way to only use the amd adapter? also, under device manager it only shows Generic PnP Monitor for monitors.
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