I try to boot up my hp proliant dl120 g5 but it gives an error message: fan failed/missing.system prepared to shutdown

Is the optical drive a DVD drive?

Have you set the machine to boot from the optical drive?

Frequently the HP boot sequence is accessed by touching the Escape key on boot.

64 Bit CPU only!

Hello! Try another disk.

Option 1 (HIGLY Recommended): HP servers should come with an install disk that prepares the windows installer for you. Boot from that disk,tell it your OS, and pop in the disk for the OS when prompted. It will come up fine and have all the HP monitoring agents installed.

Option 2: Load the driver the old fashioned way. Unless you have a floppy drive the standard "Press F6 to load drivers" trick won't work. If you do, then you'll need to put the RAID driver on the disk.

Option 3: Use an installation customizer like nLite to pre-add the RAID driver to the Windows 2003 installer.

Good luck.

this link might help you

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01868487&lang=en&cc=us&taskId=101&prodSeriesId=3896111&prodTypeId=3709945

There was a critical HP ProLiant ML350 G5 ROM BIO upgrade dated on 17 Aug 2010.
Please bookmark the bio update link HERE for reference.

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Check your monitor Hz and display resolution setting.
Did you change any video driver or resolution before reboot?
If all else fail then swap in a simple S-VGA card and let Windows 2003 to sort out the 640X480 display mode.
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Enter the bios During POST, press F10.
access the boot menu from the list of devices in the list choose your cd save and restart

when you updated the bios version, you missed updating the ipmi, and the ilo chipset, the mismatch in versions of these chipsets may cause the system to fail. There is not much to do here since there is no possible way to boot from a cd or usb to update these chipsets, however if it is possible to clear the settings from the bios it would be by clearing the cmos. if it works (chances are 50%) it will allow you to see post again and boot from a usb or cd if so have the smart start cd handy to go back to the bios you previously had.

You may need to clear the Setup configuration values (CMOS) if the configuration has been
corrupted, or if incorrect settings made in the Setup Utility have caused error messages to be
unreadable.
To clear CMOS

Locate the system configuration button (SW4) on the system board.

Press the button. AC power must not be connected.
or simple remove the cmos battery for a couple of seconds then put it back and

The G5 Series is fairly new, if you're within warranty, call 1800-okCompaq.

Could be a bad cable, a bad monitor, or bad computer hardware. Any display at all or any beep codes?

On the back, the ml350 G5 will likely have an additional Network interface jack-- this may be labeled ILO. The ILO network connect allows you to use another PC on the same network to access this system (like a remote control via VNC or RDP) even if it won't power up--literally. Inside the ILO page, (you'll need the IP address of the ILO, the default account is administrator, and the default password is listed ona paper tag attached in the rear or on a sticker. If you can get into ILO via web browser: https://ipddress of ilo, you can check the Integrated log, which can shed some light on any failures.

The ProLiant DL380 G3 server requires that both primary and redundant fans exist in a specific configuration in order to perform optimally. Any deviation from the specified configuration will cause one of the above error messages to occur and the internal Health LED to illuminate. In a ProLiant DL380 G3 server without the redundant fan option, the server will shut down after the error message is displayed. In a server with the redundant fan option, the internal Health LED will illuminate and the appropriate error message regarding fan redundancy will be displayed. The purpose of this document is to detail the required configuration for both primary and redundant fans.
DETAILS Both primary and redundant fans in the ProLiant DL380 G3 server must be configured to meet specific requirements in order to avoid the error messages above and in some instances, subsequent shutdown of the server.
All primary fan locations (2, 4, 5, 6 and 7) must be populated with a fan before the redundant fan locations (1, 3, or 8) are populated. If a primary fan location is left unpopulated, the server will display one or more of the error messages shown above. In addition, the internal Health LED (the top LED on the front panel of the server) will display the status of the fans.
When the redundant fan option is used, all redundant fan locations must be populated. ProLiant servers do not support partial population of redundant fans. If any redundant fan location is populated without also populating all other redundant fan locations in the server, the fan system will not be fully redundant and one or more of the error messages above will be displayed.
Figure 1 below illustrates a ProLiant DL380 G3 server configured with all eight fans installed for fan redundancy. The server airflow is divided into three zones: processor, I/O and power supply. Shared fans 4 and 7 each provide airflow for two zones. If a shared fan fails, the failure is experienced in both zones.
Figure 1: ProLiant DL380 G3 server configured with all eight fans installed for fan redundancy
The internal Health LED (the top LED on the front panel of the server) indicates failed or missing components. The internal Health LED should be observed to determine the status of the fans as follows:
RED LED: A red LED indicates that the minimum fan requirements have not been met. Minimum fan requirements indicate that all primary fan slots must be populated with functioning fans.

• If the 1611 fan "x" is not present (where "x" is the fan location) error message is displayed at POST and the internal Health LED is red , then a primary fan is missing.
  
  
• If the 1611 fan "x" failure (where "x" is the fan location) error message is displayed at POST and the internal Health LED is red , then a primary fan has failed.

AMBER LED: An amber LED indicates that the minimum fan requirements have been met; however, requirements for redundant fan configuration have not been met. This means that all primary fan slots are populated with functioning fans, but at least one redundant fan has either failed or is missing.

• If the 1611 fan "x" is not present (where "x" is the fan location) error message is displayed at POST and the internal Health LED is amber , then a redundant fan is missing.
  
  
• If the 1611 fan "x" failure (where "x" is the fan location) error message is displayed at POST and the internal Health LED is amber , then a redundant fan has failed.
  

Note: In a redundant fan configuration, the error message fan system not fully redundant will also be displayed at POST if any redundant fan slot is left unpopulated or if a redundant fan has failed.