Chosen Solution
White screen with no apple logo. I installed an ifixit SSD Micron 1000 GB. Installed into the iMac after loading OSX Catalina onto the SSD. Still white screen even after doing PRAM reset. Not sure if there’s also a problem with Video Card or motherboard. Asking for help.
White screen is usually indicative of a hard drive issue. Try disconnecting the internal drive and hooking it up externally and boot from it that way. Let us know your results.
No new thoughts on this?