CPU has been swapped and now there is no screen.
CPU has been swapped and now there is no screen.
For the thermal paste removal, the first thought is to use a soft-bristled toothbrush with some safe solvent, like rubbing alcohol. Regarding the BIOS upgrade, it's definitely important for compatibility with a CPU that came after the motherboard was built. However, you'll need to reinstall your old CPU.
Once you retrieve the previous version, proceed to update the BIOS. If this is your first time, consider researching online thoroughly. Since the board is outdated, you might not be able to immediately switch to the newest version—try flashing older releases first. Always do your homework, as incorrect steps could render the board unusable.
I’ve reviewed the pins and extracted as much information as possible, but some debris remains on certain pins which is proving difficult to remove.
As long as the paste isn’t touching any pins, it should work fine. Just give it a light blow if needed since you’ve been scraping it.