HP 6820s_ 456613-001_ 6040A2137801-MB-A02 _No Power On Posted on October 16, 2016 by bios-downloads.com HP 6820s_ 456613-001 No Power On Madherboard model : 6040A2137801-MB-A02 Check 19 V – Its OK Check 3.3 V on Power Buton its OK Check 5 V – Its OK Flash Main Bios Download it here HP 6820s Now the laptop Its OK.