About two Mounths ago I sold a xbox to a customer,the customer was very pleased with the mechine and it works 100%,but after about two weeks he returned it to me,becouse it was fragging,I thought that it most likely just the chip,that had a wrong bios flashed by the customer,I tryd replacing the chip and it still fragged,The customer was in a hurry and I just replaced it for him with another 1.6 board that I had laying around,once again he was happy,1 mounth later he brought it back again,same problem

and I was forced to swop it out again <_< .
I know that he hadnt opend them becouse the warentee seals(that I place on the mechines after modding) was all in tackt,he cleamed that it worked the previose day and started to frag the next way that he wanted to play.
Im now stuck with these two boards and I tried fixing them for a week now.
The mechine had the following:
1 A Aladding XT flashed with Evox M8
2 Latest Evox installed on the HDD (I Edited the INI and removed all things related to flashing and locking and unlocking the HDD)
3 XBMC Latest
I have tried the following:
1 Replace the chip
2 Checked the traces (checked the consistency with another working board)
3 Removed the chip and LPC rebuild
...And it still frags
Now theres two things thats bugging me:
1 Can it be fixed
2 How on this earth did one customer blow two mechines?
I really want to get atleat one of these boards working again any help would be welcome!!