Computer turns on, one long beeps

[sonetiliaia]

I am working on a HP Tower Computer and when I turn it on, no video and one long beep and stops and beep again. Please help. I checked power supply it's OK.

Thanks

Mr. T

 

[Tedster]

Did you bother to read the guides forum?

https://www.techspot.com/vb/topic60398.html