black display

[Jrevee]

blank laptop screen on bootup. Need suggestions

[QueenDemetria]

My laptop is only showing black display but it is booting

What kind of laptop is it? and did you do anything to damage it?

[Jrevee]

I just clean it and apply thermal paste. 

Acer v3 471g

[PixelPips]

[Tech_Dreamer]

if it's booting properly, by which you mean by you can see the desktop via a secondary monitor while it's a bloank sceen on the actual laptop, issue might be a loosened connection to the display from the mobo, you need to check with a local repair shop in that case, you can do it yourself but it's a heck of a mess once you open up a laptop..

[ttam]

blank laptop screen on bootup. Need suggestions

Black screen on laptop boot can be a few things

 

Static buildup

- Remove the battery, hold the power button for 30 seconds.

- Plug in JUST the AC power and attempt to turn it on

 

Screen backlight inverter is out

- Tilt the screen, can you see anything faded in the background?

 

Screens bad

- Hook it up to an external display and see if you get video

 

Bad ram

- Can cause no video, remove 1 stick if theres 2

 

Bad mobo

- This happens a lot. Mainly if none of the things above happen, the board or cpu has failed.

[Technane]

The fact you just re-applied Thermal paste suggests you just disassembled the complete Laptop, which includes disconnecting the display cable from the board going to the LCD panel, open it back up and check you seated it correctly, quite a fat cable normally covered in more of a cloth, largish flat and white connector on board needs  a re-assuring click to ensure engagement. 

[iMTHESAN]

You could of damaged the panel or not even connected the plugs properly. Check whatever you touched and whatever may interfere with it.