This usually makes me start working.

This does actually help, if you still have bad sections you can reserve them in GRUB or Badblocks(?) on windows iirc

I mean not actually blowing on the ram but taking it out, cleaning contacts with isopropyl and reseating it has fix memory errors for me in the past.

It worked the other day on my servers ecc ram. The greatest tech support trick of all time after ‘have you tried turning it off and on again’