How do I fix it when the fan keeps running and the unit doesn't want to turn on?
SOURCE: black screen on start up
yep
unplug the system
open the case
look for a battery and take it out
take out the memory (rams)
wait ten minutes
press power button 5 times
put everything back in
and boot it
SOURCE: Amber Light and fan running
1st thing, disconnect everything but keyboard mouse and monitor, see if anything changes.
If the issue persists, ensure that all power and card connections for the motherboard are tight and secure. If you've added RAM or other parts, remove them. Reseat the RAM in the motherboard that came from Dell.
If none of those ideas have any effect on the issue, replace the motherboard.
SOURCE: spilled water on modem now an amber light appears
More than likely when you spilled the water on the modem (external I'm guessing) it caused a short and fried your motherboard. Any type of short can fry anything connected to it...even if the device doesn't have power. Since the ethernet cable can carry voltage it can happen that way too.
SOURCE: When dell optiplex 760 pc
rmove the memory from the slot and clean it with a neat cloth and insert and switch on the computer if still not working remove the processor heat sink and clean it with a cloth apply some thin layer of heatsink solvent and fix them tightly also remove the cmos battery from the motherboard and switch on the computer then shutdown the computer and replace camos battery
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