re: Dropped a Dell All in One hard to the floor and now when I turn it on it says

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Try to open up the system, unplug and replugin everything. Remove the video card, and the small back cover over the blue panel - there's a VGA connector for the onboard video card - test to see if that works. If not, go for a minimal setup (one stick of ram and power) to see what it does in order to troubleshoot it.

Possible reasons for a system not booting after one has dropped it, in order of least likely to most likely:

The motherboard was damaged due to impact. Items to suspect from the drop in order are: RAM, CPU or case fan, expansion/graphics card, SATA cable, or possibly a jumper on the motherboard may have gotten loose. The following is what I suspect:

The All in One was damaged due to stress induced by attached cord pulling (i.e. VGA socket may be damaged if the fall caused a cable to pull on it too hard).

The all in Ome worked loose due to impact and isn't fully making contact with board socket, or board socket has been damaged.

The All in One was damaged due to impact. Items to suspect in order are: hard drive, daughterboard component along side containing USB or audio ports, power switch, power supply, motherboard or plugin-component such as RAM or motherboard.

Try to troubleshoot and diagnose it yourself to save money. If not you'll have to take it in.

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Dell Pre-boot System Assessment or enhanced Pre-boot System Assessment (PSA or ePSA) To initialize the Dell PSA or ePSA diagnostics: Restart your computer. When the Dell logo appears, press F12 key on the keyboard several times to open the One-time Boot menu. Use the down arrow key on the keyboard to select Diagnostics and press the Enter key. Follow the on-screen prompts and answer them appropriately to complete the assessment. Write down any error codes listed Use the Dell Interactive Support Agent(English only) to get information about ePSA or PSA diagnostic error codes.

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