My xps 8900 wont boot. The Dell logo doesn't even appear on the screen. This started suddenly. I did not update any apps or install any new hardware recently. Its running windows 10 fully updated. I turned off the PC this morning normally and when I got back home I tried to turn it on and this happened.

The dell logo never shows up. The fans and hard drive sounds start up and there is no beeping or anything. Nothing shows up on the screen. I have to long press the power button to turn it off again then after a few seconds it powers back on itself. So long as its plugged in it turns on without me pushing the power button now.

I tried removing the video card and use the onboard HDMI port and same issue.

I tried resetting the ram sims in its bays and same issue.

I tried unplugging some of the hard drives and same issue ( I have 4 hard drives installed)

I tried plugging the PC directly into the wall outlet instead of the UPS samen issue
Can you help me please?