When I press the power Btn Nothing happens ... Help please

When I press the power Btn on my Hp Pavilion Slimline desktop,.... the power light on top comes on   (While looking in the case,......the 3 fans - CPU/Power Supply/case fan when powered, they begin to whir.......However, after 7sec the CPU and Case fan stops and the power supply fan is still running,,
But NOTHING HAPPENs.....   no display , no hard drive running nothing...
PLease Help ....
Thank you

The basic tests required (generic example) can be found here. It always help to mention the exact model #.
Symptoms you related usually mean the PSU has failed. You can read this commentary for explanation and a lead to a new PSU.
I am a volunteer. I am not an HP employee.
To say THANK YOU, press the "thumbs up symbol" to render a KUDO. Please click Accept as Solution, if your problem is solved. You can render both Solution and KUDO.
The Law of Effect states that positive reinforcement increases the probability of a behavior being repeated. (B.F.Skinner). You toss me KUDO and/or Solution, and I perform better.
(2) HP DV7t i7 3160QM 2.3Ghz 8GB
HP m9200t E8400,Win7 Pro 32 bit. 4GB RAM, ASUS 550Ti 2GB, Rosewill 630W. 1T HD SATA 3Gb/s
Custom Asus P8P67, I7-2600k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX660 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Custom Asus P8Z77, I7-3770k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX670 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Both Customs use Rosewill Blackhawk case.
Printer -- HP OfficeJet Pro 8600 Plus

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