What does 2 long beeps mean on a computer?

Parity ErrorReseat
2 Beeps – Parity ErrorReseat/replace memory, troubleshoot motherboard. 3 Beeps – Memory Error (first 64KB)Reseat/replace memory. 4 Beeps – Timer FailureTroubleshoot motherboard. 5 Beeps – Processor FailureTroubleshoot CPU, motherboard.