Chosen Solution
I placed an SSD and the fan is going full speed. Any ideas? placed the Thermal sensors all seem ok. Does anyone tried it? Found a solution?
Your system has SATA II (3.0 Gb/s) drive ports. Is the SSD you got state in the spec sheet its compatible? A fixed SATA III (6.0 Gb/s) drive won’t work reliably. Update (09/17/2016)
Sorry ;-{ The Crucial MX300 SSD is a FIXED SATA III (6.0 Gb/s) SSD which won’t work in your SATA II (3.0 Gb/s) system here. Yes, its Mac compatible but only the newer SATA III models not this older model. You’ll need to return it and get one that can. As an example review this SSD’s specs in comparison: Samsung 850 EVO. Review the Interface line this drive is also a SATA III drive, but unlike the Crucial MX300 drive this one offers auto SATA port sense technology which allows it to also work in SATA I (1.5 Gb/s) as well as SATA II (3.0 Gb/s) systems. What ever drive you get, a FIXED SATA II or one that auto senses the systems SATA I/O ports speed it must be able to run at SATA II data rate which is why your Crucial MX300 drive is unable to work in this system.
Try SMC reset first.
