After pressing the power button , the server starts and then stops immediately, with no display on the screen . The system health LED on the front panel is Flashing red.

HP server ML350 G3 won't boot, red internal health LED
2004 time stamp in the manual, so is 15 years old, (a relic really)
and old Generation 3.
1: does the 2 fans blow, 1 in PSU , and CPU ? this be first.
sounds of that is first or you have no power or PSU is bad.
(most the time)
2: does the screen show anything, at all?
like (no signal, no sync, vga cable not connected, or the like?)
or is the screen dead,. 100% dead
ever change out the RTC coin cell inside, they don't last this long,
did you know that?
14 year old coin cell is impossible to be good. a $2 fix too.
if the coin goes bad the BIOS goes nuts, due to loss of data
in the NVRAM the coin cell powers.
replace that then do a BIOS reset, and now it ill boot to HDD 0
if and if HDD is good and if the OS is not corrupted, none stated.

Interesting, sound like a failure of the button because most system either work with a greeg lit up led or fail with an amber or orange lit or flashing.
In this instance the amber could mean something has gone bad but the fact you can hold the button and have it boot up is strange.

Does the led turn green after holding the button for a while to let the machine boot?

regards,
mike

where the cable for the power sw connects to the motherboard your polarity might be reveresed. Therefore, try switching the plug-in the other direction (groung and colored wires).

Turn the printer is the printer on. And remove the USB printer cable from your computer ..
While the printer is off, press and hold the Start / Stop in the canon of some other models of printers, press the Resume / Cancel.
While holding Start / Stop or Resume / Cancel button, press and hold the POWER button.
When the Power LED (green) lit, release the Start / Stop / resume / cancel button (without releasing the button).
Without releasing the power button, press Start or resume the Stop button or cancel button twice, then release the POWER button. Wait until the printer LCD display 0 (zero) the number of
After the screen is 0, connect the printer cable UDB to your computer, will detect the new device installed (normal), will now restore steps
solution taken from:blogspot

With this type of error, the control panel will need to be reset. The following steps will allow you to reset your control.

Solution:

1. Clear the ERROR from the screen: Press and hold the MY CYCLES and BACK buttons simultaneously for 3 seconds. The control will display any recorded errors. Please write down what error codes are shown on your screen in case service is needed. If a MORE icon is displayed on the screen, press MORE to list additional errors. When the EXIT button appears, press EXIT.



2. Remove Power: Follow the onscreen instructions to remove power (unplug unit) and then immediately plug unit back in.



3. Clear Setup Mode: After power is restored, a setup screen that begins with "Congratulations..." will be shown. DO NOT PRESS the OK button shown at the bottom of the screen. Press the START/STOP and POWER buttons simultaneously until the Home Screen is displayed.

ProLiant ML150 G6 and DL160 G6 (HP Smart Array B110i SATA RAID) does not support more than 4GB memory, (2GBX2 modules) or more added, it works fine with single 2GB module. Boot OS with single module and upgrade system Rompack to the latest version then upgrade B110i controller driver to 6.8.0.32. Shut down the server, add additional modules. It will work fine.

Software Update Instructions

• WARNING!! Do not power off the Home Entertainment Server or disconnect it from the AC power outlet. Doing so may damage the Home Entertainment Server to the point of requiring repair.
• WARNING!! Do not press any buttons, except as instructed, until the update is complete. Doing so may damage the Home Entertainment Server to the point of requiring repair.
• The software update process usually takes about 15 to 30 minutes, depending on system configuration and network connection.
1. Power on the television and make sure it is tuned to the inputs to which the HES-V1000 Home Entertainment Server is connected.
2. Connect the LAN terminal on the HES-V1000 to your Internet source using an Ethernet cable.
3. Power on the HES-V1000 Home Entertainment Server.
4. Press "HOME" to go to the Home Menu.
5. At the "Home" menu, select "Settings".
6. At the "Settings" menu, select "System Settings" and then press "ENTER".
7. At the "System Settings" screen, select "Software Update" and then press "ENTER".
8. At the "Software Update" screen, select "Network Update" and then press "ENTER".
   Note: The network connection display appears.
9. Select "Yes" and press "ENTER".
   Note: The server starts to check the version information.
10. At the version confirmation screen, select "Yes" and then press "ENTER".
11. The software License Agreement appears. After reading the content, select "Agree" and press "ENTER".
12. The software update is downloaded and automatically starts updating the HES-V1000 software.While the software update is downloading:
    
    • "DOWNLOADING XX%" appears on the front panel display, indicating the progress.
    • If the download fails, an error message appears on the screen, and the display returns to the Home Menu.
    When the software update is complete:
    
    • "VERSION UP FINISH" appears on the front panel display, indicating that the update was successful.
    • If "VERSION UP FAIL" appears on the front panel display, repeat the update procedure above.
13. The system will power off automatically.
14. Power on the Home Entertainment Server again.

Please refer the following link:
http://esupport.sony.com/US/perl/swu-download.pl?upd_id=5321&mdl=HESV1000

1. Clear the ERROR from the screen: Press and hold the MY CYCLES and BACK buttons simultaneously for 3 seconds. The control will display any recorded errors. Please write down what error codes are shown on your screen in case service is needed. If a MORE icon is displayed on the screen, press MORE to list additional errors. When the EXIT button appears, press EXIT.



2. Remove Power: Follow the onscreen instructions to remove power (unplug unit) and then immediately plug unit back in.



3. Clear Setup Mode: After power is restored, a setup screen that begins with "Congratulations..." will be shown. DO NOT PRESS the OK button shown at the bottom of the screen. Press the START/STOP and POWER buttons simultaneously until the Home Screen is displayed. Your unit is ready to function normally.

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.

Hi Franceso, plz specify
Is it powering ON ?
Which LED is glowing?
These leds are there on the front panel :

1 Power On/Standby button
2 System power LED
Green = Power on
Amber = System shut down, but power still applied
Off = No power

3 Internal health LED (Wave sign in BOX)
Green = Normal
Amber = System degraded. To identify the component in a degraded state, refer to system board LEDs.
Red = System critical. To identify the component in a critical state, refer to system board LEDs.
Off = Normal (when in standby mode)

4 External health LED (power supply)
Green = Normal
Amber = Power redundancy failure
Red = Critical power supply failure
5 NIC 1 activity LED Green = Network link
Flashing = Network link and activity
Off = No link to network.
6 UID LED Blue = Activated
Flashing = System remotely managed
Off = Deactivated
7 UID button

If it is Internal health led then any internal h/w issue is suspected.
If it is external health led then any power supply or power source related issue is suspected.
Also check the status of the server & its IML (Integrated Management Logs) in ilo (Integrated Lights Out ) if it is configured. (2nd RJ45 port in rear)

Also make sure the cabinet is properly closed.