I do have this issue too.
Had the same symptoms shown on the first post, after 1 year begin this problem.
The code 88 appears just because is the number show by default when turned on. It isn't the code of an specific error.
I tested the memory, vga (sli on my case), power source, CPU, everything...
The palliative solution:
* Forget the XFX Support Ticket (they are the worst)
* Turn on the computer by 5 minutes. (he will not boot but let it on!)
* Quickly turn off and turn on again.
* He will boot fine.
I guess the problem could be the MOBO, like the same issue on my Toshiba Laptop A-205 BGA chipset, and on some models of Xbox's GPU.
One of the chipset on CI on the board was a poorly bad designed solder. Perhaps because the XFX used lead on the solder. It could affect the contact of some CI on the MOBO. With time, heat and cold the solder can be affected.
In my opinion the hot make the contacts of the components work again.
One solution could be the Reflow and Reballing on MOBO, but is expensive. If we can know what component is the issue would be better.
Sincerly XFX mobo, nevermore.