Compaq cpt 013 aio/ computer boots, but no video. black screen

All I get is a black screen

Please give us the exact pc model.
Which os? Which monitor model?
Did it work before?
What has changed?
*** Say 'Thanks' with Kudos ***

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    HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
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