Aurora R4 Wont boot past Alien Head Image. Black Screen

Yes I have tried the GFX cards in different slots. And yes when it boots, it goes to the alienware head and beeps once, but sits there so long at the full blue bar that it beeps again, then on the 3rd beep it goes to a black screen. It probably sits there 5 minutes at the full blue bar with the alien head and beeps a total of 3 times, but not consecutively, about every 1.5 minutes

If i have my backup gpu in, it will show the product info of that card on the first black screen then just sit there.

I have enough spare parts that I have ruled everything out but the PSU, dont have any extra of those.

I don't know, but if you've been around Aurora R4 long enough when it worked, you're supposed to get one beep, at least by the time the blue bar is done loading as it passes P.O.S.T., you get a beep that means 'I'm ok'

There are many reasons why a desktop will black screen, in the rare time it happened here it black screened after the initial Windows logo when I changed my monitor for something else. Go back to old monitor and things work again. You've certainly tried a number of basic troubleshooting steps, enough that I can't say what's wrong or what to do next if it were mine. I'd be forced to go back to the last Grfx card & monitor that worked as a base line, try Grfx card in different slot. If I had a Windows DVD I might try to boot into it just to get s video output test. Otherwise, to out a bad motherboard we usually need spares of good CPU, Grfx Card, monitor, memory, power supply & good 3volt CMOS battery. Hard drive won't matter in a word where we just need access into the Bios or be able to boot into a WinDVD etc. If keyboard / mouse 'freeze' or become useless you can switch to a different USB port. Yours spazzed out for some reason, but unless you have a closet full of spare parts to test with, I'm not sure what to say, I'd encourage you to do some more reading up & continue to pursue troubleshooting steps like the ones you've already performed > may be time to consider your local Pro, get an estimate for a basic diagnosis at the shop, or enlist help of friend / co-worker who may themselves have 'known good parts' to lend or allow your parts to be tested in their stuff. If you get it figured out, report back what the fix was

Thankfully the R4 motherboard has demand & value in the market, so, even if you bought one (at a steep price) & did not need it, it could be re-sold and may even eventually sell for a good price

7JNH0 is the initial Sandy motherboard, FPV4P was shipped with Ivy, find your board by its part tag near the memory       

Basic videos & reading material here for no post / no boot, & wait for other input 

Alienware Desktop - General Hardware Troubleshooting

https://www.youtube.com/results?search_query=alienware+no+post

https://www.google.com/search?source=hp&ei=bioOWtuuO4fxmAHB166gCw&q=alienware+no+post&oq=alienware+no+post&gs_l=psy-ab.3..0j0i22i30k1l9.1751.5009.0.5206.17.17.0.0.0.0.158.1628.12j5.17.0....0...1.1.64.psy-ab..0.17.1620...0i131k1.0.VesykIo4v6Y

https://www.dell.com/support/article/us/en/19/sln114868/alienware-computer-does-not-turn-on-or-go-into-windows?lang=en

the only time mine locks up at the alienhead Bios logo is if I have a wifi in the USB3.0 top external port by the power on button, it'll freeze up & hang forever w/a full blue bar, I'm not even sure if it beeps, I don't think it does beep. With your backup GPU in, try to boot into a Windows DVD, if it works, exit / abort 'install', you're looking for signs of life out of motherboard ... of course with that backup GPU, you're merely trying to tap F2 to get into Bios or F12 to run ePSA diagnostic, won't even do that huh? If not, wait for other's help and search Aurora black screen on this forum, there might be solved answers tips or advice