HP Pro SFF 280 G9 Desktop PC Maintenance and Service Guide - Page 4

Front bezel ...24 Hard drive...25 WLAN module ...27 Solid-state drive ...29 Memory modules (DIMMs)...29 Battery ...31 Fan duct ...33 Heat sink with fan ...33 Processor ...34 Power supply ...35 System board...37 System board connections ...38 Wireless antennas and cables ...39 5 Troubleshooting without diagnostics...41 Before you call for technical support ...41 Helpful hints ...42 Solving general problems...42 Cannot access the Computer Setup (F10) Utility when booting the computer 42 Computer appears locked up and will not turn off when the power button is pressed 43 Computer will not respond to keyboard or mouse 43 Computer date and time display is incorrect ...43 There is no sound or sound volume is too low...43 Cannot remove computer cover or access panel ...44 Poor performance...44 Computer turned off automatically and the power light blinks red four times and then white two times...........45 System does not turn on and the lights on the front of the computer are not blinking 45 Solving power problems...46 Power supply shuts down intermittently...46 Computer turned off automatically, power light blinks red two times followed by a two-second pause, and the computer beeps two times (beeps stop after fifth iteration but lights continue blinking 46 Power light blinks red four times followed by a two-second pause and the computer beeps four times (beeps stop after fifth iteration but lights continue blinking 46 Solving hard drive problems...47 Hard drive error occurs ...47 Disk drive transaction problem ...47 Drive not found (identified) ...47 Nonsystem disk/NTLDR missing message...48 Computer will not boot from hard drive...48 Computer seems to be locked up ...48 Solving audio problems ...49 Sound cuts in and out ...49 Sound does not come out of the speaker or headphones 49 Computer appears to be locked up while recording audio 49 iv