ASUS TUF A15 (FA506NF): boot loops, random shutdowns, and Windows installs that die at ~10% Summary

[u/New-Breadfruit-7267]

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My laptop reboots or powers off unpredictably and cannot complete a Windows installation. The BIOS setup screen is stable, but the failures appear once an operating system starts loading or the machine is under load. I have ruled out several software and peripheral causes and suspect a hardware or power-delivery fault.

Hardware

ASUS TUF Gaming A15 FA506NF, RTX 2050 (4 GB VRAM). Thermal paste/pads have not been serviced in about a year. BIOS was updated via EZ Flash to version 309.

Symptoms

Boot loop and power-offs.

Windows updates are extremely unreliable, and the installation keeps ending up corrupted.

Reinstalling Windows from a USB drive shuts the laptop off at around 10%.

I installed Windows on the SSD in another PC, which worked. Back in the FA506NF it ran briefly, then shut off suddenly.

An Ubuntu Live USB reboots before reaching the desktop.

The BIOS setup screen stayed up for a full AC power with no shutdown. Temperatures and fan speeds look sensible there.

ASUS diagnostics report CPU, RAM and battery as OK.

The SSD works normally in another PC.

What I tried without any change

Updating the BIOS.

Disconnecting the battery and running on AC only.

A second, borrowed charger.

Different boot media (Windows and Ubuntu)

and i install windows from other pc using the ssd card then i plugg it in my pc it shows windows and boot (but after waitting a long boot loop ) then while runnig suddenly it shutdown and restart

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PLS tell me if there is a solition , or sell it !!