where do the settings of your screen at boot come from.

Yeah, not so visible on the first video but on the catalina screen... that's most likely a hardware issue. Take it in, it is and if there's an Apple store close by, go in with the installer and show them that even with a full erase and reformat, it's blurring through the install.. Ugh.

:(

Thanks for the reply MRdontknowitall,

Since this only occurs after booting, let's place your device in safe mode. Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS and fonts not installed by macOS. It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. And it deletes some system caches, including font caches and the kernel cache, which are automatically created again as needed. Take a look here for steps on how to place your device in safe mode:

How to use safe mode on your Mac

If the issue does not occur in safe mode, there is likely something in your user account causing this issue.

If this occurs in safe mode as well, please reach out to us here: Contact Apple Support

Cheers.

Well, right off the bat, have you run Malwarebytes? https://www.malwarebytes.com/mac-download/

I am seeing a *lot* of the xpcproxy messages and it's a known vector for a few viruses - it IS a legitimate mac process, but, can be hijacked.

Run that and see if it finds anything..

Am not sure, unless you are looking at the Activity Monitor and see some program running.. It seems very unlikley.

The only other option I can suggest is to use a *different*, Mac and make a bootable USB - https://support.apple.com/en-us/HT201372 - installer with the latest OS (Catalina?) that is on your system. Plug it in, reboot to the USB installer and go to the Disk Utility and do a FULL erase, reformat then *repartition* the ENTIRE SSD - not just your Macintosh volume - and reinstall. Beyond that, it is a guess as to what got into your system. If it is on both the newer and older Macs you have, it likely is some very tricky code. (This is why I stick to only private trackers and always read the comments before downloading a torrent file)

You *might* try the Apple Stackexchange forums, they do offer very technical help, as does MacRumors.

Good luck!

Yes. The Console gives all the info on running processes. It is the same for both devices. What OS is on each computer?

Please do.

ALSO, more important, can you take a photo or video of the boot issue you are seeing and put a link to it so we can see? I am quite curious of what it is doing..

Hey there MRdontknowitall,

Thanks for reaching out to Apple Support Communities. We understand that your screen appears blurry. There are multiple settings that adjust the appearance of your screen. Take a look at this helpful article for these settings and a further explanation on what each option does:

Change Display preferences on Mac

Have a great day!

After you boot your 2007 MacBook, go to the Console and look at the system.log - note the time you booted and then post the output here. IF there is a rogue process happening, it will be written down. Post the boot log.

When you had the logic board replaced, perhaps the service did not properly reseat the connector or place the electromagnetic shield tape over the connection?

From what you write of, seeing vibrations and ghosting - shadows - in the display, it seems as if you are experiencing some signal 'ingress' - intrusion - of a signal into your display.

I am at a loss beyond that.

If you have had a new system install and new logic board installed, the only thing left is the display itself, or the connection it has to your mainboard.

Possible?