Probook 450 G6 with 500gb ssd and 1tb hdd. I have a Smart hard disk 3 (309) message

[Stryker3]

I have a Smart Hard Disk Error message Hard Disk 3 (309)....backup content immediately.

I believe the OS was installed on the SSD.

The system will not boot so I can back up my data from the HDD.

Ran sys diagnostics...took 1 hour to quick check disk....passed.

Everything is REALLY slow.

Where do I go from here?

[WAWood]

@Stryker3 

You can try running diagnostics to check the drive, although with the newer SSDs, this often does not work.

If your PC is new enough to support UEFI, you can use these steps to test the hard drive: http://support.hp.com/us-en/document/c00439024

If not, to check the drive you have to follow these steps:
1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over.
2) Eventually, you will see an HP Startup Menu
3) Press the Function key for testing the hard drive (usually F2) and let it run.