I have an HP Envy 4 Notebook PC with model 4-1080ee

It was working fine last night but when I woke and turned it on this morning, suddenly it's showing a very dim screen. It's still working okay in the background and if I look closely, I can still see everything and I was still able to print the DxDiag. I already tried adjusting screen brightness and contrast but it doesn't work. I tried turning it off then on again, but it still gives me a dim screen.
Can anyone help me on this please? Thank you so much
Details of my laptop:
Operating System: Windows 7 Home Premium 64-bit 6.1, Build 7601 Service Pack 1 7601.win7sp1_gdr.130104-1431
System Manufacturer: Hewlett-Packard
System Model: HP ENVY 4 Notebook PC Model: 4-1080ee
BIOS: InsydeH2O Version 03.72.02F.0B
Processor: Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz 4 CPUs, ~1.7GHz
Memory: 4096MB RAM
Available OS Memory: 3998MB RAM
Page File: 1390MB used, 6604MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11

If you have a monitor to hand or can borrow one, the first step is to see how it goes from the external output.

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