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Hp 500 tower switches on only sometimes but no signal detected by monitor

HP Recommended
Pavilion 500
Microsoft Windows 10 (32-bit)

I have a Hp 27xi monitor with my Hp 500 tower. The monitor switches on but can't detect a signal from the tower.

I've tried DVI, VGA and various HDMI cables. 

With repeatedly turning the monitor on and off, occasionally it will lock on to the HDMI signal and I can use my computer, but it seems to be getting worse. 

As per advice I pulled out and reseated the video card to no effect.

The on button for the tower is starting to not work occasionally now too.

Hard reset did nothing, neither did removing all power including CMOS battery.

Does anyone know what's going on or how to fix?

HP Support Agent
HP Support Agent
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Thank you for posting on HP Forums,

Echo_Lake is at your service.

I understand you are in need of support,

And to help you out, I'm sending out a Private message to assist you with the next course of action.

Please check your Private message icon on the upper right corner of your HP Forums profile

Next, to your profile Name, you should see a little blue envelope, please click on it or simply click on this link:

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