All the lights come on when I switch on my HP Pavillion dv9600 but the screen is blank.

DO THIS FIRST - Perform a hard reset If a PC suddenly fails to boot properly, you should perform a hard reset as the first procedure.

1. Disconnect all peripheral devices and remove all USB devices and media cards. You want to test the computer not the accessories!
2. Disconnect the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds .
3. Reconnect the AC power adapter (but do not connect the battery), Press the Power button, Look for glowing LEDs near caps lock and num lock keys, and Listen for sounds of a disk drive and fan turning.

Actions to take after performing hard reset If no error message is displayed:

• Connect an external monitor
• Test for memory module problems
• Test the hard drive
• Contact HP for technical assistance

If a text error message is displayed, see Troubleshooting Error Messages on a Black Screen During Startup or Boot

Black Screen with No Error Messages Connect an external monitorAll the lights come on when I switch on my HP - c02076105.gifuploads/images/c02076105.gif" alt="c02076105.gif" class="h_mi" /> If there is a problem with the LCD display's back light or a corrupted graphics driver, the display may appear blank but the notebook may be displaying information. Attach an external monitor to test the display. If the image displays on the external monitor, there may be a graphics driver conflict. To resolve this, turn on the computer and press f8 key, then select Enable low-resolution video . If the image displays on the LCD display in low resolution, you can download and install the latest drivers for your specific graphics driver. If there is an image on the external monitor but the notebook display remains black, contact HP for technical assistance. Disconnect all peripherals and repeat the hard reset Even though users are instructed to disconnect all peripheral devices from the notebook when doing a hard rAll the lights come on when I switch on my HP - c02069237.gif some devices are often overlooked. Double-check that all devices are disconnected including: external keyboard and mouse (wired or wireless), USB connected external drives and devices, thumb drives and flash drives, network storage devices, PC card, SD memory cards, express card, eSata connections, firewire or similar devices, printer, scanner, camera, port replicator, or docking station, any CD/DVD from the optical disc drive, and any media from the multi-card reader.B
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Chris Thrash