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What's the meaning of error beeps from the speaker?

If you find that there is no system display after the power is turned on, you may check the problem according to the number of beeps from the following table. Number of beeps Meaning of error 1 DRAM refresh is not working. 2 Parity circuit is not working or parity status bits are not cleared when parity is disabled. 3 First 64k memory test failure. Address line test (A0..A15) failure. 4 System timer is not counting properly. 5 Processor register/flag test failure. 6 8042 keyboard controller gate-A20 error. 7 Processor exception error encountered. 8 Display memory R/W test failure (NON-FATAL) 9 ROM-BIOS checksum error. 10 CMOS Shutdown Register R/W error