MacBook Pro grey screen on startup, no apple logo.

Hello,
Today I've been working on my MBP(2009) and everything worked perfectly, then I had to shut my MBP down. It happened with no problem. Next time when I've tried to start it up, only grey screen appeared with no Apple logo and it persists no matter how long I wait. Anybody who encountered the same issue?
Thank you for your help.

I have followed this text, however I have no peripheral devices connected (no charger, no ethernet, no usb filled). They tell me to access the modes with keyboard shortcuts, but I cannot do that, when I cannot get over the grey screen at the beginning.

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