Having problems with your HP Compaq Presario v4000 Notebook ?

No picture put adapter in, it turn on laptop by itself, its led light is on, but no picture on screen.

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Answers :

How to tell:\015\012\015\012have you got a spare monitor? plug the spare monitor into the (right) side of the laptop as i have done in the image: http://img32.imageshack.us/img32/1439/15062009001u.jpg\015\012\015\012as BillW50 has stated, once external monitor has been plugged in, press the combination of Fn and F4, this should switch the display to the external monitor you have just plugged in. If it doesnt work the first time, try the combination a few times as there are different modes for the Fn+F4 (such as LCD only, LCD + external, external only, external 1 + lcd 2....ect)\015\012\015\012if you get a picture on an external monitor but not on your laptop, then the most likely problem is with your laptop screen itself, which it is most safest to take to a computer/laptop repairs specialist. \015\012\015\012If you DONT get a picture on the external monitor, the scenario seems most likely in the computer's Graphics Card/Display Unit. A malfunction there is most likely causing a no picture or no signal to the LCD.\015\012\015\012In my situation, a picture had lasted on the Laptop's screen for about 10 seconds, then a very muddled up screen, then no picture, this was the result of the LCD within the laptop as you can see i have plugged in another computer screen to test my above theory.\015\012\015\012hope that can help you\015\012\015\012Tim
If you mean you hooked up an external monitor and you want to see the display there. Well there should be a Fn key combo to toggle the displays. It should be one of the keys that looks like a monitor plus the Fn key at the same time. Otherwise go into the Control Panel -> Display -> Settings and you can switch to the other monitor there. Hope this helps.
Repair Help & Product Troubleshooting for HP Compaq Presario v4000 Notebook

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