3.4 Troubleshoot Mobile OS Application Issues: No Sound From Speakers 3. Software Troubleshooting (220-1002), Comptia A+ (Plus), Comptia A+ (Plus) 220-1002 This entry is part 233 of 278 in the series Comptia A+ (Plus) 220-1002 Series Author: Previous Article 3.4 Troubleshoot Mobile OS Application Issues: Frozen System Next Article 3.4 Troubleshoot Mobile OS Application Issues: System Lockout Latest Posts Storage Area Network (SAN) APM and ACPI Acceptable Use Policy