My monitor will turn on with a new build. It says no signal. I tested the monitor and it works. I plugged my graphics card and

you wanna explain it in the form rather than the title...
as we have no idea what you did with the gpu.

no signal and jump to standby as soon as the computer has power means bad cpu.
no signal just sitting there for 10-15 seconds then goes into standby even when the computer is on can be anything from a bad gpu, mis-settings in the bios, bad leads, wrongs selected output on the monitor.
 

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