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Optiplex 780 will not boot: 1 & 3 lights blinking & Power Button Blinking Amber

Last response: in Computer Brands
November 5, 2013 3:20:31 PM

Dell Optiplex 780 mini tower.
Computer was working okay yesterday, no changes were made or work done on the box.
Walked into the office this morning and saw:
Computer seemed to be powering/shutting down in intervals of about 1 second.
I pulled the power cord and plugged back in. Attempted to power up the box without success.
The power button flashing Amber and lights 1 & 3 are flashing.
Performed the following:
Pulled the power supply from working 780 in installed in this box.
Result: No Change - same symptoms.
Pulled RAM from working 780 and installed in this box.
Result: No change - same symptoms.

Reviewing the manual diagnostic codes (lights only since box will not post).
Manual points to RAM. But, as I mentioned, this computer was working fine with no changes made to RAM prior to issue. And, since I tested with known good working RAM from another 780, a memory issues is not suspected.

Please help with any suggestions or ideas. willybak@GMail Dot Com

More about : optiplex 780 boot lights blinking power button blinking amber

November 6, 2013 5:15:42 AM

I'm going to suggest replacing the CMOS battery on the motherboard here as a first step or at least checking that it's at 3v. I can't explain how or why it is but, that battery going bad can cause quite a few strange issues
December 16, 2013 2:03:43 PM

Just fixed the same issue by replacing power supply unit.
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