Thank you reply and advise. Retried clear CMOS and flash MOD BIOS. But ,SLIC Table not found. Unknown ACPI Table found. ACPI Signature.... Table DescriptionUnknown Memory AdressFFF02A80h Table Length-1 bytes OEM ID...... OEM TableID........ OEM RevisionFFFFFFFFh Creator ID.... Creator RevisionFFFFFFFFh RSDT and XSDT Table OEM ID=_ASUS_