There's not a lot of info to help you here!
Maybe it's as simple as: you accidentally disconnected the power button.
On the other hand, assuming that the PSU is powering on (does the fan start spinning? Does it continue to spin?), you could have a dead PSU, or an overload condition, which causes the PSU to shut down.
As a test, you can actually power up the mobo without a video card: it should force a series of beeps.
Otherwise, it could indeed be a corrupt BIOS.
Need more info!
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