memory - Lenovo Thinkpad 400 beeps after installing 2x4GB RAM - Super User
Popular Topics: BIOS, UEFI - Lenovo Support US
P50: Two beeps and blank screen - what are my options for troubleshooting, parts salvage, etc.? Please help me brainstorm what to do with this "bought as defect" machine. More in comments. :
How to solve a PC Beep Code 1-3-3-1 Problem - Quora