I've inherited an Optiplex 780 that had no harddrive but was working when the previous owner removed it. I purchased and hooked up a new harddrive. When I try to turn the computer on, I just get 2 beeps and no booting. No flashing light codes or further beeps. There is a yellow light on the mother board that does not flash. Anyone have ideas?
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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?
Forum Member since 2004
I am not a Dell employee
No memory Detected is LOW and SLOW beep beep beep.
2 Beeps means there is an error. Video is common.
If there is a video card installed remove it.