Acer aspire laptop black screen problem?

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My acer aspire 1642 wlmi (2005) will load up when you turn it on but with no power to the screen. I have read that this is sometimes due to a low power function built in to the laptop. It seems to be intermittent sometimes it will start up as normal. I have tried it on the battery and on the mains adaptor together and seperately. The adaptor is giving out 19volts as it should be.
Any ideas?

 

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Ermmmm, does it have an external screen port at the back? You could try it on an external monitor to see if its a screen fault. You might need to tap FN and another key to activate the external screen.

Dave

 

Yep. Funny that few days ago I was going through our AV equipment and was writing instructions on how to operate laptop + projector combo (presenter view in powerpoint, rear/front display, etc.) and I was wondering why the key isn't the same for different laptops. I even had 2 Acer laptops where on one it was Fn + F3 while on the other Fn + F5.

 

yeah tried the external monitor option but still no luck.

 

Can you disable power saving options in the Bios?

 

thats sounds like a good plan will try it if i can get the screen up.

 

I have tried the Bios options but there is not one to disable power saving options. Any ideas?