- Joined
- Sep 21, 2010
- Messages
- 13,413
- Motherboard
- HP 17" 17-by3053cl
- CPU
- i5-1035G1
- Graphics
- Intel UHD Graphics, 1920x1080
- Mac
- Classic Mac
- Mobile Phone
Kinda of. I've heard reports like that over the past couple of years. Did you disconnect all your other drives when you installed El Cappy?...Weird huh?
Well, boot into Yo, flushing the cache (UseKernelCache=No or -f boot flags). If the SysDef is still iMac11,1, use iMessage.debug2 to determine the MLB & ROM ID Values. See How to Fix iMessage, Chapter 7.1. iMessage.debug is an attachment in the 1st post. Save these values just in case.
You can use MultiBeast for Yosemite to change your Yosemite SysDef and using Chapter 7 as a guide to get iMessage working again.