RoHe
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RE: yellow light motherboard computer will not boot

LED on motherboard is perfectly normal.

What form factor 780 is this, desktop, tower, small form, ultra-small?

Have you checked the 4 diagnostic LEDs on rear of PC when it won't boot? Look up error code in the manual: downloads.dell.com/.../optiplex-780_service manual2_en-us.pdf

Tried installing a fresh motherboard battery?

Are you sure those RAM modules are compatible with this PC? Have you tested them one at a time in slot 1?

Ron

   Forum Member since 2004
   I am not a Dell employee

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