Question windows

Oct 23, 2020
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I have a asus essentio cm5571 desktop PC that has been in storage for a year and now it's not working, worked fine before. Symptoms,
Once plugged in and start button pushed, white start led indicator light not working, both fans, processor and power supply are working.
Looking at the board I don't see any bulging or leaking caps, everything looked plugged in correct, green S/B indicator light is on, it's a bit dirty on the inside? I get no video,monitor works.
When turned on (?) DVD drive green light blinks 7 times. no warning screens,
I'm stumped!
Anybody been through this before? Anybody got a solution to this?
 

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