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<DIV><FONT face=Arial size=2>Every 24 to 48 hours I get a hard crash on my Myth
Backend:</FONT></DIV>
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<DIV><FONT face=Arial size=2>kernel: CPU 0: Machine Check Exception:
0000000000000004<BR>kernel: Bank 4: b200000000070f0f<BR>Kernel panic: CPU
context corrupt</FONT></DIV>
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<DIV><FONT face=Arial size=2>My reseach pointed to a likely hardware issue, so
one at a time I tried the following:<BR>- swap RAM with a known "good" chip<BR>-
swap RAM with a different known "good" chip<BR>- ran memtets86 for a week (no
failures)<BR>- moved around the PCI cards<BR>- swapped video cards<BR>- tried
different PVR500 cards<BR>- swapped CPUs<BR>- kernal updates to
2.6.12</FONT></DIV>
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<DIV><FONT face=Arial size=2>After each change the system still crashed with the
exact same error. More research pointed to a potential issue with the
nVideo chipset and DMA. I then set the system to boot with no DMA and it
is rock solid. The only problem is that 3 or 4 PVR500 recordings and a
stream or two leave the system in a 50% cpu wait state due to the slow
disk.</FONT></DIV>
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<DIV><FONT face=Arial size=2>I'm having a hard time believing there is a DMA
issue with the nVideo chipset and there is virtually no discussion of it, so I
assume it's something hardware related to the disk.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Next I'm planning to pull the CDROM and swap the
IDE cables. Does anyone have other ideas I should try? I've been
holding off on:<BR>- a power supply swap since I don't have a big enough spare
and would hate to spend the money for a "test".<BR>- drive swap since it will be
a pain<BR>- motherboard swap since it will be an expensive test</FONT></DIV>
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<DIV><FONT face=Arial size=2>BTW, it is an ABIT NF8 motherboard that I am
otherwise very happyy with.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Thanks,<BR>Todd</FONT></DIV></BODY></HTML>