HP ProDesk 400 G7 SFF Maintenance And Service Manual page 5

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) ............................................................................................................................................................... 55
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) ......................................................... 55
Solving hard drive problems ................................................................................................................................................ 57
Hard drive error occurs ..................................................................................................................................... 57
Disk transaction problem ................................................................................................................................. 57
Drive not found (identified) .............................................................................................................................. 57
Nonsystem disk/NTLDR missing message ................................................................................................... 57
Computer will not boot from hard drive ........................................................................................................ 58
Computer seems to be locked up ................................................................................................................... 58
Solving audio problems ........................................................................................................................................................ 59
Sound cuts in and out ....................................................................................................................................... 59
Sound does not come out of the speaker or headphones ......................................................................... 59
Computer appears to be locked up while recording audio ......................................................................... 59
Line-in jack is not functioning properly .......................................................................................................... 60
Solving printer problems ...................................................................................................................................................... 61
Printer will not print .......................................................................................................................................... 61
Printer will not turn on ...................................................................................................................................... 61
Printer prints garbled information .................................................................................................................. 61
Printer will not print .......................................................................................................................................... 61
Solving keyboard and mouse problems ............................................................................................................................. 63
Keyboard commands and typing are not recognized by the computer ................................................... 63
Mouse does not respond to movement or is too slow ................................................................................ 63
Solving hardware installation problems ............................................................................................................................. 64
A new device is not recognized as part of the system ................................................................................ 64
Computer will not start ..................................................................................................................................... 64
Power light blinks red three times and then white two times ................................................................... 65
Solving network problems .................................................................................................................................................... 66
Network driver does not detect network controller .................................................................................... 66
Network status link light never blinks ............................................................................................................ 66
Diagnostics reports a failure ............................................................................................................................ 66
Diagnostics passes, but the computer does not communicate with the network ................................. 67
Network controller stopped working when an expansion board was added to the computer ............ 67
Network controller stops working without apparent cause ....................................................................... 67
Cannot connect to network server when attempting remote system installation ................................ 67
System setup utility reports unprogrammed EEPROM ............................................................................... 68
Solving memory problems ................................................................................................................................................... 69
System will not boot or does not function properly after installing additional memory modules ...... 69
Out of memory error ......................................................................................................................................... 69
ENWW v