Computer is on. Light is showing. There is no content on the VGN-NS21Z

Hello

Laptop Sony VGN-NS21Z

I have a big problem with the Sony VGN-NS21Z computer

The problem is as follows:

When I turn on the laptop, only a power light appears, nothing appears in the content screen, it does not appear at all

I made sure of these things

1. RAM cleaned and working.

2. A screen that you have confirmed is on.

3. New and existing thermal paste.

Someone tells me a problem with the ic, Chipset or Bios

If it is a problem from the ic, Chipset, and Bios, where exactly are they located on this computer?

Note, when I want a laptop to turn off, I keep holding the power button. The laptop does not turn off completely until I remove the battery. This is something that happened after this problem.

Wait for solutions, thanks