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pc turns on but not monitors or keyboard

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Varying refresh rates/aspect ratios/resolutions on monitors can cause all sorts of issues. I'd unplug one so you only have one monitor connected to the computer.
 
and failing all of the above, maybe it's time to consider stripping it all down and reassembling on a piece of cardboard.

inspect each part as you do so, and clean each part - and it's corresponding motherboard slot.
clean any dust build up on the fans and heat sinks.
as you assemble it outside the case, keep it simple and only connect the core parts needed to get a signal on the screen - so only 1 RAM, no drives, 1 screen, no mouse or keyboard.
that should give you multiple beeps at startup (assuming you have one of those round, little, black, motherboard speakers connected) and possibly a 'no keyboard present' error on the screen.

also take to opportunity to replace the thermal paste for the GPU and CPU.
 
Re-seat, not reset.

To re-seat a GPU you take it out, inspect the connections (including the power connectors) and put it back in.

The GPU being out is a great time to look around for other loose cables or potential issues - my best guess is that the computer got bumped or having it turn off caused something to shift and cause an issue.

GPU, RAM, and Power connectors are easy things to check first while you have the sidepanel(s) off.
 
did you end up reassembling the whole thing on a piece of cardboard, and with only the core components to get into BIOS.
so no drives, no GPU (use the onboard port), no mouse (just a keyboard so you can press the Fn key to get into BIOS), only one stick of RAM, no external devices, no PCIe cards.

at this stage we just want to get a signal on the monitor.
if you have done all that and still nothing, it's time to start swapping out parts - and this is where having the stuff outside the case makes things easier.
I'd be starting with the power supply, then the motherboard - of course, making sure the parts you use for testing are compatible.

OR.... if this all seems too much or you can't get easy access to parts to test, it may be time to get the services of your local computer shop.
 
did you end up reassembling the whole thing on a piece of cardboard, and with only the core components to get into BIOS.
so no drives, no GPU (use the onboard port), no mouse (just a keyboard so you can press the Fn key to get into BIOS), only one stick of RAM, no external devices, no PCIe cards.

at this stage we just want to get a signal on the monitor.
if you have done all that and still nothing, it's time to start swapping out parts - and this is where having the stuff outside the case makes things easier.
I'd be starting with the power supply, then the motherboard - of course, making sure the parts you use for testing are compatible.

OR.... if this all seems too much or you can't get easy access to parts to test, it may be time to get the services of your local computer shop.
i didn’t put everything back but i can take more out, and if not i guess i’ll have to bring it somewhere since i don’t have any extra parts
 
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