Don`t assume the PSU is fine. The LED may be on but your symptoms are typical of a failure. I would change that component first and hope that when it failed it didn`t blow a motherboard component as well.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.