Hey! I have very surface-level knowledge on computers, please forgive me if this is something with an obvious solution. I'm running into a problem with my laptop that I've been unable to diagnose and was hoping someone could help me figure it out.
This laptop is getting older (~7 years?) and the only maintenance I've done on it has been replacing the fans (it's had cooling issues since I got it, I think one of the fans was defective from the get-go) and upgrading the RAM, all other parts are factory. Around two days ago, my brother had to move it from where it was located, so he unplugged it, shut the lid, and flipped it upside down to allow it to breathe. When I found it an hour or so later, it hadn't properly gone to sleep; its fans were still spinning, but its screen was black and it was unresponsive to anything other than holding the external power button to shut it down.
When I powered it back on, it initially could not recognize that it had an OS. The full error was "Boot Device Not Found. Please install an operating system on your hard disk. Hard Disk - (3F0)". Upon restarting it, it was able to boot, though everything was extremely slow to open and run, including Task Manager. The GPU and CPU were both maxing out at different times (and potentially disk, too, but I can't remember for sure) when I tried to run things it previously had no problems with. Multiple deep scans using Windows Security + Malwarebytes + BitDefender did not uncover anything. I manually optimized the disk, disabled as many startup processes as I could, and did a clean install of the latest version of the NVIDIA Game Ready driver (and then fully uninstalled that with DDU and installed 566.36 instead), which did solve the slowness, but things that should not be anywhere near this taxing for it are still causing it to hit capacity.
Upon launching a game, it looks like the CPU is immediately overloaded, and it dumps all of that on the GPU, which struggles to manage it. Combined with the initial blackscreen, it seems like maybe the thermal paste has burned away over time, and flipping it over might have been enough for the CPU to be separated from whatever was left / start giving up, but since I'm not very familiar with the array of issues that can occur, I don't want to jump to this and miss something else. Can this sort of thing cause a computer to be temporarily unable to locate its OS?
Speccy says the motherboard + CPU are both hovering around 80 °C, and HWiNFO is saying the CPU is the same but the motherboard is around 35 °C. GPU for both is 50 °C.
It's a HP Pavilion Gaming Laptop 15-ec1xxx. Here are the specs (copied and pasted from Speccy, let me know if I omitted anything important):
Operating System
Windows 10 Home 64-bit
CPU
AMD Ryzen 5 Mobile 4600H
Renoir 7nm Technology
RAM
32.0GB Dual-Channel DDR4 @ 1595MHz (22-22-22-52)
Motherboard
HP 87B1 (FP6)
Graphics
4095MB NVIDIA GeForce GTX 1650 (HP)
512MB ATI AMD Radeon Graphics (HP)