76 User Guide• Problem determination - Trained personnel are available to assist you withdetermining if you have a hardware problem and deciding what action isnecessary to fix the problem.• IBM hardware repair - If the problem is determined to be caused by IBMhardware under warranty, trained service personnel are available to providethe applicable level of service.• Engineering change management - Occasionally, there might be changes thatare required after a product has been sold. IBM or your reseller, if authorizedby IBM, will make Engineering Changes (ECs) available that apply to yourhardware.Be sure to retain your proof of purchase to obtain warranty service.Please have the following information ready when you call:• Machine Type and Model• Serial numbers of your IBM hardware products• Description of the problem• Exact wording of any error messages• Hardware and software configuration informationIf possible, be at your computer when you call.A compatible monitor, keyboard, and mouse are required for many serviceactivities. Before you have the computer serviced, be sure to have thesecomponents attached to your computer, either directly or through a consoleswitch.The following items are not covered:• Replacement or use of non-IBM parts or nonwarranted IBM partsNote: All warranted parts contain a 7-character identification in the formatIBM FRU XXXXXXX.• Identification of software problem sources• Configuration of BIOS as part of an installation or upgrade• Changes, modifications, or upgrades to device drivers• Installation and maintenance of network operating systems (NOS)• Installation and maintenance of application programsRefer to your IBM hardware warranty for a full explanation of IBM's warrantyterms.Before you call for serviceMany computer problems can be solved without outside assistance, by using theonline help or by looking in the online or printed documentation that comes withyour computer or software. Also, be sure to read the information in any READMEfiles that come with your software.Most computers, operating systems, and application programs come withdocumentation that contains troubleshooting procedures and explanations of