Can't keep external monitor video feed on after Macbook lid is closed

[brasskey]

I'm not sure what I'm doing wrong, but I just can't figure out how to keep the computer from going into sleep mode when I have an external monitor connected and the lid on the Macbook is closed.

The specs on my Macbook are as follows:
Late 2008 13" Aluminum Macbook
2.4 Ghz Intel Core 2 Duo
4 GB RAM
NVIDIA GeForce 9400M 256 MB
OS X Lion 10.7.3

I am connecting to an older Westinghouse LCD TV with no problems. I am going from the Macbook Mini DisplayPort to the TV with a Monoprice Mini DisplayPort --> DVI adapter. The picture comes across great on the TV but will not stay on once the Macbook is closed. I did some research and found that the external display should automatically stay on with OS X Lion. That's not the case for me. I also read that if a key is pressed on an external keyboard once the lid is closed, this will wake the external monitor. I connected an external keyboard and tried pressing a key, but that also didn't work for me. Lastly, I tried InsomniacX, but it didn't work either.

Any ideas on what I could be doing wrong? Thanks.

 

[simsaladimbamba]

InsomniaX
or
InsomniaT (rebuild for SL) (fix for 2011 MPBs)
or
Caffeine
​

You could also try SmartSleep.

 

[Peace]

http://support.apple.com/kb/HT3131

Hope that helps.

 

[brasskey]

InsomniaX
or
InsomniaT (rebuild for SL) (fix for 2011 MPBs)
or
Caffeine
​

You could also try SmartSleep.

I'll look into those others. Thanks.

http://support.apple.com/kb/HT3131

Hope that helps.

I've already been to that site. I tried what it suggested before my initial post,

"When you close the lid:
In OS X Lion, the external display will change to a blue screen, then will show your desktop.
In Mac OS X v10.6.8 and earlier, wake the computer up by clicking the mouse button or by pressing a key on your external keyboard.
You should now be able to use your Apple portable as you normally would, with a USB keyboard and mouse."

Neither (automatically recognized by Lion or pressing a key on an external wired keyboard) worked for me.

 

[Peace]

Do you have a different brand mini-display port to DVI cable ? Maybe that's the problem. I've heard about some Monoprice cables being kinda funky.

Also. does the TV have HDMI ? If so try a mini-displayport to HDMI cable.

 

[brasskey]

Do you have a different brand mini-display port to DVI cable ? Maybe that's the problem. I've heard about some Monoprice cables being kinda funky.

I don't. I have a Mini DisplayPort --> VGA though. I'll try that.

Also. does the TV have HDMI ? If so try a mini-displayport to HDMI cable.

No it doesn't. But, I tried a Mini DisplayPort --> HDMI cable on my living room TV and the same thing happened (couldn't keep external monitor on after closing Macbook).

All cables I have are Monoprice. I guess that could be the problem, but it's weird that all three would be bad.