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Comments
I'll give you instructions for updating the BIOS to the latest P11.B4.
I think you should check your existing memory and see if it is DDR3L 1.35 V or DDR3 1.5 V. It will be written on the label on your memory.
If your existing memory is 1.5 V, I would recommend the Kingston memory below. Try to match the same 1.35 or 1.5...whichever you have.
https://www.kingston.com/us/memory/search?DeviceType=2&Mfr=ACE&Line=Aspire&Model=89520
In theory, it shouldn't matter mixing DDR3 and DDR3L on your xc-605 desktop mainboard, but I remember someone else had a problem mixing for some unknown reason when using DDR3L Crucial memory on their XC-605. If you're in doubt, I would recommend the Kingston memory.
Here's instructions for updating your BIOS, but I don't think that's really your problem.
The standard operating procedure (SOP):
1. Download P11.B4
2. Extract
3. Copy the Win and ROM folders to a USB flash drive.
4. Open an admin command prompt
5. If your USB flash drive has a drive letter of F, then you would type
F:
cd win
flash
6. After the processing completes, restart your computer
7. When it prompts you to enter the BIOS, press the "delete" key on your keyboard to enter the BIOS settings
8. Load the BIOS defaults (F9) and then save/exit (F10).
Your mainboard should work at either 1.35V or 1.5V. But for whatever reason, it doesn't like mixed ram. If you install two 1.35V DDR3L modules, it will work fine. If you install two DDR3 1.5V modules it will work fine. DDR3L is supposed to run at 1.35 or 1.5, but for whatever reason, your mainboard/UEFI doesn't like mixing DDR3 and DDR3L.
My mainboard is running 1.5V DDR3. (I have TC-605 which uses the same mainboard as XC-605)
https://www.kingston.com/us/memory/search?DeviceType=2&Mfr=ACE&Line=Aspire&Model=89520
Tinkerer
To create USB. Open cmd as admin.
Diskpart
List disk
Select disk "your disk number no quote "
Clean
Create partition primary
List partition
Select partition "your partition number"
active
Format fs=fat size=4000 quick
Download the Acer bios from drivers and downloads, extract the exe, and place the contents on the USB
NOTE: If you try to do the wrong version; and keep holding FN+ESC, you will enter efi shell where you can load EFI protocols and device drivers, and execute simple scripts.