Dell optiplex 755 solid yellow light
Good day folks. I found this junker in my shop and decided to play around with it a bit, more to improve my skills than anything, since it's probably not worth the headache 
It's a Dell Optiplex 755 which doesn't turn on: power light is a solid amber, fan is spinning but that's it. None of the 4 diagnostic lights come on at the front. The PCI tester shows 00 all throughout...like the CPU is not present, though it is getting hot. Could be that VTT is present, but not VCC - haven't measured too in-depth due to the lack of a schematic.
What I tried/ruled out so far but didn't work:
1) Tried different PSU
2) Removed 4 SMD capacitors near the CPU per a video I found on YT (and put them back shortly after, since nothing changed)
3) Removed and flashed the flash SPI chip (which I hope I identified right, since it's the only one on there).
4) No visibly bulged caps, though it doesn't mean they're good
5) Heated up the board slightly
6) Removing RAM causes no changes or beeps - normally it should beep AFAIK
Is there anything else worth trying, or is some major component done for which would make it impossible/impractical to replace ? If someone has a schematic they can provide that would be wonderful, just to be really thorough.
It's a Dell Optiplex 755 which doesn't turn on: power light is a solid amber, fan is spinning but that's it. None of the 4 diagnostic lights come on at the front. The PCI tester shows 00 all throughout...like the CPU is not present, though it is getting hot. Could be that VTT is present, but not VCC - haven't measured too in-depth due to the lack of a schematic.What I tried/ruled out so far but didn't work:
1) Tried different PSU
2) Removed 4 SMD capacitors near the CPU per a video I found on YT (and put them back shortly after, since nothing changed)
3) Removed and flashed the flash SPI chip (which I hope I identified right, since it's the only one on there).
4) No visibly bulged caps, though it doesn't mean they're good
5) Heated up the board slightly
6) Removing RAM causes no changes or beeps - normally it should beep AFAIK
Is there anything else worth trying, or is some major component done for which would make it impossible/impractical to replace ? If someone has a schematic they can provide that would be wonderful, just to be really thorough.
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