I found three problems:
Log Name: Application
Source: Windows Error Reporting
Event ID: 1001
User Name: N/A
Fault bucket 619053140, type 5
Event Name: AEAPPINV2
Response: Not available
Cab Id: 0
The AEAPPINV2 indicates you should consider flashing your Bios.
Security Processor Loader Driver ROOT\LEGACY_SPLDR\0000 This device is not present, is not working properly, or does not have all its drivers installed.
This could indicate corrupt graphics drivers.
Universal Serial Bus (USB) Controller PCI\VEN_1033&DEV_0194&SUBSYS_84131043&REV_03\4&100198E&0&00E4 The drivers for this device are not installed.
You will need to get these from the Builder (OCUK)
Then there is the issue with the health of the SSD. If I were you, and it hasn't been too long, I'd go back to OCUK.
If you can hold on for a little while, I'll ask for another opinion, but even a refurbished unit shouldn't act this way.