Welcome to HP Support Forums. 🙂 I came across your post and would like to help.I understand that you would like to know if the HP 2y House Call Elite/All-in-One DT SVC extended warranty for the HP Desktop PC - 870-129 starts after the first year of factory warranty or it starts from the day the PC is purchased. Is that correct?
Usually, the extended warranty that you buy directly from HP, starts from the day you purchase the product and not after the one year factory warranty expires.
Hope this answers your question. Please feel free to let me know if you have any queries. Cheers! 🙂