Answer to "How do I attach replacement power button to main board?"try these website there cheaper: http://www.aliexpress.com/item/For-HTC-One-Mini-Upper-Boad-Flex-Headphone-Volume-Power-Flex/1940557616.html http://www.etradesupply.com/htc-one-mini-motherboard-flex-cable-ribbon.html these websites are cheaper but they take longer to come and i have order mine from aliexpress and im still waiting for it. i hope dis was a bit of help
Answer to "How do I attach replacement power button to main board?"i had same problem u had and i tryed solder it but it never worked so instead i ordered the hole thing i bought mine for 24.80 pound but i cant find the original i got it from here a different website. http://www.ebay.co.uk/itm/Genuine-HTC-One-Mini-Upper-Boad-Flex-Headphone-Volume-Power-Flex-/171203017155?pt=UK_Replacement_Parts_To...