My Haswell box gave out last year. Didn’t bother trying to revive it cause it wasn’t cost effective. Gave me a good 9 years of service though. Anyone want an rx580?

You mean POST, Power on self test. DOS hasn’t been a part of Windows since XP. And yeah replace the Knopfzelle (usually a CR2032) on your mobo. Your mobo is resetting everytime you power off cause the mobo isn’t getting any power. That’s what the battery is for.