Motherboard is not a standard form factor, so a standard ATX board will not fit in the case. The case wiring itself is not standard ATX either. To replace the board with an aftermarket ATX board will require a new case.   If you have the original memory, put it in and disconnect all other devices including USB devices and do a CMOS reset by removing the coin cell battery. It's not uncommon for aftermarket memory to act up, even if they have been working fine for months before.   If that does not work and a BIOS recovery option does not work either, than a motherboard replacement will be your only choice.
Hello I had been using my computer daily this week the suddenly I turned it on and nothing (everything turns on, fans,light but no video on screen), checked all cables reset connections on the board with no luck. The power led (Alienhead) gives to yellow blinks then stops and gives a 3rd blink and keeps repeating, I started reading posts on various forums including here and reddit and according to most users that have the same symptoms and most seem to agree  it's 2 things computer can't read memory and Bios error (also the error codes table that comes in the manual say the same thing), so I tried the following : 1.- What I mentioned before reseting all cables and card on the board. 2.- Reseting the BIOS (Unplug PC,move jumper,etc etc) 3.- Reseting the BIOS and removing the battery 4.- Replacing the memory (I was using aftermarket memory) with the original and repeating steps 2 and 3. 5.- Did the steps above several times with same results so I kept digging and fount the Bios recovery feature so I tried that first just by pressing CTRL+ESC and nothing.      - Used my service tag to get the latest BIOS in another computer and renamed the .exe file as mentioned here (put it on a FAT 32 formated USB Thumb Drive) : [URL]      did that then repeated steps 2 and 3 several times (all this with original memory), same result.      - Found another post saying you should extract the .exe (13MB) file before renaming, you run it using some parameters and it results in a slightly larger file (16MB) rinse and repeat steps 2 and 3.      - Noticed that you can download the file in other formats and one matches the extension that you rename the file to in the steps above and it's a 32MB file so I tried that, rinse and repeat steps 2 and 3. The only things I noticed different when turning on the PC while pressing CTRL+EXC is that the blinking alienhead happens 2 or 3 times then stops but no video signal so I left it a couple of minutes each time to see if something happens and nothing. At this point I don't know what to do, my support expired Dec'21 and to renew it it would cost close to $200 before dell would even try and help or replace the mother board but from what I've read even replacing the board doesn't guarantee that this wont happen again in the future, for that amount I can buy a new motherboard and PS and forget about all this problems. My Specs are : AMD Ryzen 7 3700X16GB Dual Channel HyperX(FM) FURY DDR4 XMP at 2933MHz (original memory)Nvidia GeForce RTX 3080,1TB M.2 PCIe NVMe SSDWindows 10 Home English (not relevante because it doesn't post)CPU Liquid Cooling and 1000W Power Supply A few months back I replaced the original memory with this : VENGEANCE RGB RT 32GB (2 x 16GB) DDR4 DRAM 3600MHz C16 Memory Kit – Black I runs fine but only at 1.2V so It's limited to 3200 at that voltage, I could do manual config of the parameters and have it run a 3600 C16 but once you reboot or turn off the system it seems that it reverts to 1.2V (needs 1.35 to reach that speed) and wont start, reboots 3 times and reverts to no overclocking so you have to manually adjust so I stopped doing that and left it with the automatic settings (don't remember if it's the first or second profile) and had been working like that for months with no problems. More recently I adjusted the timings manually to get the C16 leaving it at 3200MHz and 1.2V and it seemed to work fine for a week or so until this happened. Any suggestions would be greatly appreciated, otherwise I would probably have to go and replace the board and PS  with an aftermarket solution (As I understand the 24pin plug for the MB is not standard so I would have to replace it). Best Regards Jerry
Aurora R10, blinking yellow power button, no post