Q: Mac mini keeps rebooting

MY mac mini oct 2014 keeps rebooting non stop.

a Call to support result that either i go to an Apple store or a technician would come after New Year (when ???)m

someonz had the same issue and knox how to solve it??

I Saw on a pafe of the site that there is a soft to dizgnose hardware failres but it went too fast and i did not note the exact name and also where to sownload it

someohe can help?

IM in frane but as the site is in english I wrote in english but i can also do it in french of course...l

thabks in advance and a more happy new year than ine

henri