It isn't the problem to get the slic in but more of avoiding the cmos checksum failure. When i'm having another idea for a mod I'll come back to you. Maby Yen has more luck, or use a softmod for the time being.
Are you shure you aren't using some soft mod ?? Can you please uninstall the cracks of any. You can use voatktoools to uninstall them. After uninstallation of the cracks (if any), can you please install ACPI Scope. Open ACPI Scope and go to File-->Load ACPI Information-->From BIOS save it as ats file and upload please.