My dell optiplex 7040 wont turn on at all

It does not turn on completely but when the BIST BUTTON is pressed fans start spinning. What might be the issue. Please help

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Maybe a little more verbose description of the symptoms would help.

Like, what do you mean by "not turn on completely"? And what is BIST?

What are the power and drive LEDs doing?

What is the screen doing?

Give us something to work with if you want a good answer!

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