Help needed

Ok so I followed a guide to unlock Imessage and it told me to change the type of iMac on Clover and make things with serial number and now when I clicked restart my machine won't boot back up... It load then everything shuts off... Need help...

My specs are : CPU: Ryzen 5 3600 GPU: GTX 1070 Motherboard: Asrock B450m AC HDD: Seagate 1TB hard drive

submitted by /u/youngsnak
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