Frequently Encountered Issues - No Power On ( Active Display ) - Diagnostic Startup Process

If your Exxact computer system will not power on with a known good display …

Symptoms- no display, no blinking cursor, no fans, no LEDs, no beeps

Power Drain PSU ( Power Supply Unit ) -

Remove power cables from system -

Check AC power source with a known good device -

Replace power cables if in doubt

Drain Workstation ATX PSU

Disconnect AC power cable from ATX PSU.

Move ATX PSU main power switch to ' off ' position.

Allow the system to rest this way for a minute.

Reconnect AC power cable.

Move PSU main power switch to ' on ' position.

Note state of LEDs.

Drain Server Multiple Modular PSUs

Disconnect AC power cables from all PSU modules.

Remove all PSU modules from slots.

Allow the system to rest this way for a minute.

Replace all PSU modules into their respective slots.

Reconnect all AC power cables.

Note state of all LEDs.

Keyboard-Video-Mouse ( KVM ) Connection -

Connect a known good USB keyboard and mouse to USB ports on the backplane of the computer.

Ideally, one of the GPUs will have been identified with a sticker on the back plane as the active/default video output device.

Initially, a port from this device will output a display signal at startup.

If no display is detected from any GPU port, it will be necessary to connect the monitor to the onboard VGA port ( blue socket with nine pin holes ) .

Always power cycle the monitor prior to starting the system and whenever switching video ports.

System Power On -

Note power on symptoms -

Audible beep sequences

Two digit hexa-decimal characters on the display or system board

Vendor logo splash screen

System configuration or error messages

State ( steady or blinking ) and color of all visible LEDs

Fan activity ( not moving, spinning slowly or changing speed )

Attempt to restart with keyboard or power button inputs

Restart the system with <Ctl+Alt+Del> key combination

... or ...

Restart the system by holding the power button

… or …

Wake the system by clicking mouse buttons.