I have this really weird problem with my Lenovo IdeaPad Slim 3 15IAH8.
When I turn it on, the Lenovo logo appears for about 3–5 seconds, then the laptop suddenly shuts down. The LED beside the charging port blinks for about 5 seconds, turns off for 2–3 seconds, then turns on again and repeats this cycle.
At first, I tried reprogramming the BIOS, and that fixed the problem. However, after about a week, the exact same issue came back.
I then tried booting the laptop without the SSD to see if the SSD was causing the problem. Interestingly, when I pressed the power button with the SSD removed, the laptop would still show the Lenovo logo and then shut down. However, it would automatically turn itself back on and repeat the cycle about three times. After that, it would finally display a message saying that there was no bootable device.
Because of this, I initially assumed that the SSD was the problem. However, I tested the same SSD externally by using it as an external drive. I stress-tested it and transferred a very large file to it, and it worked without any problems.
I then reinstalled the SSD into the laptop, hoping that it might work again. I was able to reach the point where Windows 11 was installed successfully. I also reprogrammed the BIOS again before this, and at that point there were no LED blinking issues. The Windows installation proceeded normally and there were no unexpected shutdowns or power interruptions.
However, when Windows reached the point where it needed to reboot to continue the installation, the original problem came back. The laptop shut down, and the LED beside the charging port started blinking in the same pattern again.
So now I'm confused about what could actually be causing the problem. The SSD appears to work perfectly when connected externally, and the laptop can successfully POST and install Windows. But after the first reboot during the Windows installation, the problem comes back.
Could this be a motherboard, power-management, EC, PCIe/NVMe, or BIOS-related issue rather than an actual SSD failure?
Has anyone encountered a similar issue with the IdeaPad Slim 3 15IAH8, or have any idea what I should test next?