black screen. no bios, no windows

Thank you. I will try this first and report back.

I can't even get my specs because I can't get into anything. Will have to check my specs manually because the PC is 2 years old so I can't remember all off the top of my head.

I will try the CMOS reset, and if no go I am going to try removing a few things - RAM, etc. to see if anything happens.

I will report back when I have done these things. Thanks for your help.

I have tried a few things now to no avail -

Removed CMOS battery, left it out for 45 min, replaced.
Removed RAM
Removed GPU
connected HDMI direct from monitor to on board mobo port
removed all preiphials and SATA from power supply.
tried a different monitor

Still the same problem. I should clarify it's not really a black screen.. it is no signal at all to the monitor. For the past 2 weeks the boot process has been slow, taking 1/2 hour to 1 hour, and now nothing. would this point to a bad PSU? Or does it sound more like the CPU or MOBO? The hardest problem I am having is determining exactly what it is.

Specs are below, some I can't actually confirm because I can't get into the PC. It's 2 years old and I can't remember the CPU off the top of my head sorry.

I should also ad that as I was removing components and putting them back in, I had the PC lying down on it's side, and I found a small ball bearing right next to it. Is it possible it fell out of the PSU? Because it was right near the back of the PSU on the floor. I don't know where else it would have come from. The PSU had always made loud whirring sounds sporadically since I got the PC. It went away for the past year or so, but strangely enough when I did the "hold power button in for 1 minute while disconnected", when I turned the PC back on the PSU whirring sound was back and loud as hell. Then when I remove these components I find a ball bearing there. Maybe I'm clutching at straws here, but any chance the ball bearing came from the PSU? confirming that the PSU is the trouble maker here?

Main Board: Z97 Gaming 3 MSI____________________________________ ___
Bios Version: ?_______________________________________
Video Card: GTX 770_______________________________________
PSU brand and model: Corsair 500W_______________________________________
12v rail Rating of listed PSU: ?_______________________________________
CPU: ?_______________________________________
Memory: 32GB RAM_______________________________________
SSD/ HDD: X2 Samsung SSD + 1 HDD_______________________________________
CPU COOLER: ?_______________________________________
Raid Card: X_______________________________________
Sound Card: ?_______________________________________
Keyboard: MEchanical Keyboard_______________________________________
Mouse: Steel Series_______________________________________
Any Additional hardware plugged into your system: X_______________________________________
OC: (Yes / No) No
Operating System: _______________________________________

no post.

My next idea was to check the PSU. I have a friend coming over tomorrow with a spare and will check that.

I'm really hoping it is the PSU, and not the Motherboard or CPU (due to cost to replace).

Because of the strange noises the PSU makes and has intermittently made since I had it, I am thinking that is where the problem is.

I will report back after swapping the PSU. Any advice here is appreciated.