Acpi\sny5001 Driver Here

I installed it. It took 10 seconds. No reboot needed.

I went back to Device Manager. The yellow triangle was gone. had moved to "System devices" and was now named Sony Firmware Extension Parser . acpi\sny5001 driver

That's when it clicked. The fan wasn't broken. Windows simply didn't know how to control it because the driver was missing. The laptop was running a "safe mode" fan profile: ON all the time. I installed it

And the fan? Within 30 seconds, it spun down. Then stopped completely. Dead silent. It only came back on when the CPU actually heated up—exactly as it should have from day one. I went back to Device Manager

I went to Sony's support site (using the model number from the sticker under the laptop: ). I looked for "Driver - Firmware" and downloaded a file called Sony Firmware Extension Parser Driver (sometimes labeled "Sony Shared Library" or "VAIO Control Center").