System not starting up black screen
I replaced my iMac's CPU and PCIe/NVMe SSD (i5-i9 and M.2 with adapter).
The unit turns on and hard drive spins together with the fan and there are two LED lights that turned on but when I install the Monitor, the monitor doesn't show anything (the monitor is also brand new because I need to replace the entire iMac screen due to broken glass panel). See image attached.
By the way, my unit is 2019 5k iMac.
Update (10/12/23)
Hi. The situation worsened, after I put everything back (the original CPU and Blade SSD) only the second led is on and the rest of the four LEDs are off.
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