What does 4 beeps on a computer mean?

Timer FailureTroubleshoot
4 Beeps – Timer FailureTroubleshoot motherboard. 5 Beeps – Processor FailureTroubleshoot CPU, motherboard. 6 Beeps – Keyboard Controller FailureTroubleshoot keyboard, motherboard. 7 Beeps – Virtual Mode Exception ErrorTroubleshoot CPU, motherboard.