speedstep
6 Thallium

Re: Optiplex 755 only turns on through power supply button, no video output.

You didnt say what the diag lights said.

You didnt say you tried ram 1 stick at a time.

If the ram is bad a new motherboard will not help.

If the video card is bad the onboard should still work with vga when the video card is removed.

If the power light is blinking amber The computer is receiving electrical power, but an internal power problem may exist.

  • Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).
  • Ensure that all components and cables are properly installed and securely connected to the system board (see the "System Board Components" section for your computer).
  • Perform the power supply self-test, if applicable (see Power Supply Self-Test). <ADMIN NOTE: Broken link has been removed from this post by Dell>

If the power light is steady amber — A device may be malfunctioning or incorrectly installed.

  • Ensure that the processor power cable is securely connected to the system board power connector (POWER2) (see the "System Board Components" section for your computer).
  • Remove and then reinstall all memory modules (see Memory).
  • Remove and then reinstall any expansion cards, including graphics cards (see the "Cards" section for your computer).
  • Perform the power supply self-test, if applicable (see Power Supply Self-Test). <ADMIN NOTE: Broken link has been removed from this post by Dell>


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