My computer will come on but then displays a message that states "DVI no signal" then goes to sleep

[Cole11884]

I will turn my computer on. The computer comes on but then a message appears that States "DVI No signal" it has other words in the message but all I could get before another message appears that States "Going to sleep mode" then a black screen 

[Grzwacz]

Greetings,

Welcome to the forum.

I am not a HP employee.

The error you are seeing usually means you should reseat video connections to the monitor and the DVI out port on your PC or try a new video cable.

The discrete graphics card or onboard graphics could also have failed.

Reseat the discrete graphics card or replace this device. Or try onboard graphics if available.

Install a discrete graphics card if you: have an open x16 slot on the motherboard and are currently using onboard graphics.

Regards

[Cole11884]

I can't do anything because my monitor goes straight to sleep mode and then goes black