We are used to thinking that everything has a fix, and we only have to tweak some settings or download a file, but, sadly, hardware does fail, sometimes permanently.
If you have multiple RAM sticks, you could try with just one at a time, and you could remove some of those 4 drives which are hung off the motherboard at the moment. This might show up a weak power supply.
If you still had no luck, maybe something on the motherboard is kaput.