Incorrect number of parameters for function 'ISBLANK()'. Expected 1, received 2

Try this = 

AND(
    OR(
        ISPICKVAL(Status,'Closed as Duplicate'),
        ISPICKVAL(Status,'Closed - Resolved'),
        ISPICKVAL(Status,'Closed - Unresolved'),
        ISPICKVAL(Status,'Refund Denied'),
        ISPICKVAL(Status,'Refund Processed')
    ),
    OR(
        ISBLANK(ContactId),
        ISBLANK(Case_Resolution_Comments__c),
        ISBLANK(Delivery_Type__c),
        ISBLANK(TEXT(Category__c)),
        ISBLANK(TEXT(Program__c)),
        ISBLANK(TEXT(Product__c)),
        ISBLANK(TEXT(Reason))
    )
)