And now it doesn’t display anywhere, not dimly on the screen nor on an external monitor. Is there anyway to “undo” that uninstall without access to a screen?

This is not normal.
If all hardware operates properly, uninstalling the display adapter and monitors will not do any damage. I’ve done it many times myself on many different laptops. The laptop should start properly, detect all missing (uninstalled) hardware and reinstall drivers automatically. Apparently, hardware in your laptop do not operate properly.

Here’s what you can try. Turn off the laptop, unplug the AC adapter and disconnect the battery. Wait for a few minutes, connect the adapter and try turning it on again.

I got my laptop back from the shop and did the last ditch thing you said below before I sent it off to Dell.

You said to “Just in case. I’m not sure if it’s going to help but try it anyway. Boot your laptop with an external monitor. Go to the device manager and delete (uninstall) the display adapters and monitors. Restart the laptop and test again.”

And now it doesn’t display anywhere, not dimly on the screen nor on an external monitor. Is there anyway to “undo” that uninstall without access to a screen?

I will try to replace the inverter board. But how much it costs?

Model is HP Pavillion dv2842se.

I don’t know. You’ll have to search for a new inverter. The best way to find the right part is searching by the HP part number. The part number should be somewhere on the inverter board and it looks like XXXXXX-001 (where XXXXXX is a string of numbers).
Find the inverter part number and google it.

This guide explains how to disassemble an HP Pavilion dv2000 series notebook and access the inverter board:
http://www.insidemylaptop.com/replaced-damaged-lcd-screen-in-hp-pavilion-dv2000-notebook/

Again, it’s possible you have more than one problem in the laptop and replacing the inverter board will not help to fix issue with the power button.

I will try to replace the inverter board. But how much it costs?

Model is HP Pavillion dv2842se.

Thanks.
KiranKumar

If problem with the mother board, is possible to start laptop. Because, when I use the quickplay remote to start laptop, it is starting and all the LED lights are glowing(Power and quickplay) and problem is screen backlight.

The backlight problem could be related to the inverter board failure. You can try replacing the inverter.
But I don’t know why your laptop not starting when you press on the power button. Could be bad power button board, bad cable, bad connection, etc… I cannot tell without looking inside the laptop.

Repair Man: What happens when you press on the power button? Can you hear any noise coming from the laptop?
Also, when the AC adapter is plugged. Can you see any LED lights on the laptop indicating that the laptop is getting power?

KiranKumar: When I press power button no noise and nothing is happing. And AC Adapter plugged I see the power charging LED lights on laptop.

Repair Man: If both the power button and screen backlight failed at the same time, there could be a problem with the motherboard.

KiranKumar: If problem with the mother board, is possible to start laptop. Because, when I use the quickplay remote to start laptop, it is starting and all the LED lights are glowing(Power and quickplay) and problem is screen backlight.

Thanks,
KiranKumar

The faint image on the laptop screen could be related to the inverter/backlight lamp failure but I don’t think this is the only problem with the laptop. You said the power button stopped working and it’s not related to the inverter/backlight failure.

If both the power button and screen backlight failed at the same time, there could be a problem with the motherboard.

I actually mentioned the possibility of that button/sensor being stuck and the guy just said “I’m sure the technician checked it.”

Hopefully they did.

I am using the HP Pavillion dv2842se laptop from past 2 years. I never face any problem till now.

Two days back I shutdown the laptop normally after my work. After 2 hours I tried to start the laptop but the power button and HP quickplay buttons are not working. So I tried to start the laptop with HP quick play remote. From remote it is starting but my screen is black. I noticed that if I look at my screen from an angle with an external light, I can see the icons and everything. What may be the problem.

Thanks,
Kiran

I ordered the wrong screen at first but didn’t try to install it since I could tell they weren’t compatible but now I’m sure I have the right one. I’d try the display adapter uninstall but the repair place still has my laptop. I’ll suggest that they try that though.

I hope that replacing the motherboard works. If not I’m out quite a few bucks and still left with a mystery machine.

Thanks RM