I have a HP desktop

[southernladiesrock]

I accidentally unplugged my desktop before shutting down and now it won’t come back on. It comes back up with the HP symbol only.

 

[RealBeast]

It most likely corrupted the bootloader/OS drive boot record.

You should have (or be able to get) some kind of boot disk depending on which OS version you are using.

What is the HP model, the Windows OS version, and does it have an optical drive (CD/DVD) or just USB ports?