Aurora R4, tried to upgrade PSU and GPU now it won't turn on

Is it Aurora R1 or 2-4 you have?

What is the exact model number of your system and I am guessing that the new PSU is not a Dell OEM part. Dell PSU and MB are very proprietary so how did you discover how to plug in the cables from the new PSU. Plus parts of that MB look suspicious. Have you heard or seen any problems such as sparking, etc?

@redxps630 it's a Aurora R4 but the one without the vents.

@JOcean​ the PSU has all the cables so I figured it would be fine. I can't see why not.

replace cmos battery with a new one.  only connect psu 24/8 pin to motherboard.  disconnect dgt board usb cable for now.  use a simple video card to test.  try to look for a clear cmos jumper on motherboard.

https://www.dell.com/community/en/conversations/alienware-general-locked-topics/picture-of-the-cmos-jumper-on-aurora-r4-motherboard/647f26f0f4ccf8a8deb535e3

Power the system off. Remove the cover. You want the jumper #13 on the right. It is on pins 1/2. Put it on pins 2/3. Wait 5 seconds. Put it back on pins 1/2. Close the cover. Power the system on.

Aurora AlienFX MIO daughterboard

1) Yellow Audio connector is wrong, plug it into motherboard Audio header (#23)

2) Clean out black header, then find the double-ended USB2.0 5x5 cable, connect one end into motherboard, other end into daughterboard

Make sure USB2.0 & Front Panel 5x5 are all connected

Good time to post photo of the motherboard & the connections you made

Out of curiosity: what is the brown square thing in the top right corner of the original picture? It looks like a bag of sand?

@Vanadiel​ pic is posted upside down, it's a crusty dust bunny, desktop (& rad etc) needs air-dusted asap

Ah ok, that might be an issue if it's that dusty and it was disturbed and then powered on.

@Cass-Ole​ ok I found that 5x5 cord it wasn't connected. Where does the motherboard end go?

From several photo-diagrams in this thread now, see motherboard schematic: Audio to #23, USB2.0 pair to 19 20 or 21, Front Panel to 18 ... CPU 8pin to 4, 24pin to 9 ... ... ... then other end of MIO USB 5x5 to MIO board #25

@Cass-Ole​ ok so I found the audio.

This is the USB slots I put the other end of the MB USB 5x5 here because I can't find anywhere else to put it.

This is the current look of the I/O board.

It's hard to do these msgs on phone lol. I tried turning it on again with just the MB+I/O plugged in 3 places(24pin, 8pin, 4pin) and the power button doesn't respond still.

'Flexbay' (mediacard reader) USB goes into #1, see pic 

Aurora R1-R4 top external power on button has a 'weak' plunger-design, they either break or act hit-or-miss; always gently press it down & if it doesn't turn on then press down in several directions hoping it eventually 'catches / contacts', it might work sooner or later. If not, manually jumpstart the motherboard on as follows:

1) Make sure power supply is plugged in, & rear switch is on (when equipped)

2) Remove side panel, find & disconnect front panel JFP1 (blue) 5x5

3) Use a flat-blade metal tool like a screw driver tip, touch #6 & #8 poles together momentarily, see if power supply clicks on, or not, if all is ok then it should click on

*if it clicks on = sign that top external power on button is bad or going bad 

@Cass-Ole​ ok I'll give that a shot. Little confused about this flexbay thing because I don't have any card reader at all. It's just a simple R4 with no vents on the top. I noticed every YouTube guide I've looked at shows I guess version 2 of this case design but that's not mine. It is definitely an R4 though.

my R4 has no top vent either. The ALX has top vent and front /top led.

@JOcean​ I responded to you earlier but I'm just clarifying. I have a brand new modular 850 80 Gold PSU with every cable the old PSU had so I thought it would just be plug and play but nothing worked. So I reverted back to the old PSU to diagnose and still not turning on but! The graphics card blue light comes on whereas with the new PSU nothing shows.