If all the issues turned up after installing an aftermarket video card, I would do three things before purchasing anything major:
1) Buy some thermal grease ($5 on Amazon or the Austrian equivalent) and re-seat your heat sink with newer (likely better quality) thermal grease.
2) Disable the onboard card in the device manager/BIOS. It could be that the CPU is still running the onboard graphics chip, and can't handle both.
3) Flash a BIOS update, if one's available. Check if there are any known issues between your MB chipset and the GPU you installed.
After that, I'd replace the PSU and the CPU fan. Both.
1) Buy some thermal grease ($5 on Amazon or the Austrian equivalent) and re-seat your heat sink with newer (likely better quality) thermal grease.
2) Disable the onboard card in the device manager/BIOS. It could be that the CPU is still running the onboard graphics chip, and can't handle both.
3) Flash a BIOS update, if one's available. Check if there are any known issues between your MB chipset and the GPU you installed.
After that, I'd replace the PSU and the CPU fan. Both.
"There remain four irreducible objections to religious faith: that it wholly misrepresents the origins of man and the cosmos, that because of this original error it manages to combine the maximum servility with the maximum of solipsism, that it is both the result and the cause of dangerous sexual repression, and that it is ultimately grounded on wish-thinking." ~Christopher Hitchens, god is not Great
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