Several comprehensive PDF guides for computer repair and maintenance are available for free download from educational and archival sources.

: A detailed guide covering hardware and software issues, hosted on e-bookshelf.de .

: This visual guide on Scribd uses logical steps to help identify hardware failures.

: This series by Scott Mueller is an industry staple. You can find full-text PDFs of the 19th Edition and earlier 8th Edition through Pearson Education’s servers.

: A structured educational guide for PC maintenance is available from Synergy Polytechnic . Common Troubleshooting Steps Included in These Guides

: For mobile-specific issues, you can access the Laptop Troubleshooting and Repair Guide or the Laptop Maintenance and Repair Workbook on Scribd .