I was cleaning out old PC (physical cleaning) and when I hooked it back up the resolution was set to 800x600. When I changed this my monitor, a tv, went to unsupported mode. I have checked a PC monitor and another tv, all get same error. I can to a system restore, and don't know how to boot to safe mode.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".