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- Laptop black screen, unable to boot when internal hard drive...

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10-15-2021 10:10 AM
Hello,
Last friday my laptop of about 3 years old (hp pavilion 14-bf180nd) randomly broke on me (after some travel by train, but no severe bumps). Normally I have a laptop HDD and an M.2 SSD connected internally, but the laptop will not get past the boot screen when these are inserted, so not even the BIOS is accessible. When the hard drives are removed I need to wait about 30 seconds before the screen becomes backlit, and then I can press escape and use the BIOS normally. HP includes a BIOS recovery program to check for disk error etc., but this is not accessible because it says it is corrupted.
Once I can get in the BIOS I can change the boot order to boot off a USB, this (mostly) works. Ubuntu sometimes crashes, but live Debian works everytime. When in the OS, WiFi networks are seen but I am not able to connect. Ethernet is unable to use DHCP, and when setting a static IP I am able to send a few packets but always 90%+ packet loss.
I have visually checked the motherboard for damage but I am unable to find any. I checked a few capacitors for voltage lines, and they seem stable but unsure since I don't have any schematics/pcb layout.
When trying to use a USB WiFi adapter (since USB seems to work), the driver is unable to initialize the card.
I am unsure what the root cause is of these issues, to me it seems like there is some voltage line that is unstable or something like that. What could be a reasonable explanation for these issues and is it fixable?
Replacing the motherboard is not worth it seeing the age of the device, and cost.
I have knowledge of software and electronics but not so much of laptop/pc hardware. The battery in this laptop has been bad for over a year.
Thanks for any help.
10-16-2021 03:17 AM
TL:DR: Very weird behaviour, possibly a broken voltage reference somewhere?
Since I am able to boot into linux, I did some testing. I was able to boot of a USB with the internal drive connected once, but trying to read it from /sda/sda3 stalls after 250 KB, very weird. Then I tried to use USB network tethering from my android phone, which had the same effect as an ethernet connection. I am only able to "connect" if a set a valid static IP, so DHCP is not working. And them I am able to make a few small requests, like pings. Requesting a webpage fails, and after some time pinging even the gateway fails.
I tried to copy the syslog and dmesg to my android phone, and the plot thickens. On my laptop I can read the contents just fine, presumbly because it is stored in RAM. But when copied to my phone, it looks like the following:
What could this possibly be?