G4 MDD 1.25 dual Motherboard Replacement Docs or Help

Hi, all!
I searched the best I could in the forums before posting, so if I missed a link to this, I'm sorry!
I have a replacement motherboard coming in and even though I have a very talented and technical friend coming by to help, it'd sure be nice to have some instructions on removing the current motherboard and the subsequent install of the newer one.
Mine is having kernel panics about 98% of the time on attempted startups and I've tried (along with the Apple Store Genius Bar) everything I know how to do or have Googled and read. I think it's perhaps a USB bus issue.
I did manage to get it to boot from the Apple Hardware Test and everything passed.
And, one of the USB connectors on the back of the machine is damaged, so I figure a complete motherboard swap should eliminate all possibilities except for maybe the CPU which seemed to pass.
So back to the original query...are there docs somewhere to guide one in the removal of the motherboard?
I run a recording studio with this machine and I'm dead in the water!
Thanks in advance!
Buzzy
(I am looking into either a new MacIntel or possibly a used G5 to replace it with)

Hi there.
I found a couple of links that downloadable take-apart service manuals for the G4 MDD. They weren't as easy to find as I thought they might - but I've taken other G4's apart and the principle is the same even if the picture is a little off, lol.
The first was the best site - sometimes though it didn't download the pdf when I clicked on it - took me to another tab then i had to click the little download link near the bottom twice to complete the download - but the guides are worth the trouble.
http://www.eserviceinfo.com/index.php?what=search2&searchstring=PowerMacG4
These are some other useful links I found:
http://www.macgurus.com/forums/showthread.php?t=19016
http://www.youtube.com/watch?v=uEfNH1DaJUo
In general though, are you sure it is the motherboard causing the problem and not something like a stick (or four) of RAM? They are the most common causers of kernel panics. Been going through the same thing with a stick of RAM I bought for a G4 MDD 1.25ghz DP like yours - technically it meets all the requirements for this model - I've run multiple tests which all say the ram stick is good - but when it's installed, I start getting kernel panics, programs quitting, random freezes and such. When I remove it, it's much slower, but no panics of any kind.
Good luck.

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DMI BIOS
vendor   LENOVO
version   DKKT20AUS
date   03/16/2011
DMI System Information
manufacturer  LENOVO
product   INVALID
version   Lenovo Product
serial   INVALID
UUID   {FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}
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vendor   LENOVO
model   To be filled by O.E.M.
revision  To be filled by O.E.M.
serial   INVALID
DMI System Enclosure
manufacturer  To Be Filled By O.E.M.
chassis type  Desktop
chassis serial  INVALID
DMI Processor
manufacturer  Intel
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clock speed  3400.0 MHz
FSB speed  100.0 MHz
multiplier  34.0x
DMI Port Connector
designation  J1A1 (internal)
designation  PS2Mouse (external)
port type  Mouse Port
connector  PS/2
DMI Port Connector
designation  J1A1 (internal)
designation  Keyboard (external)
port type  Keyboard Port
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DMI Port Connector
designation  J2A1 (internal)
designation  TV Out (external)
connector  Mini Centronics Type-14
DMI Port Connector
designation  J2A2A (internal)
designation  COM A (external)
port type  Serial Port 16550A
connector  DB-9 male
DMI Port Connector
designation  J2A2B (internal)
designation  Video (external)
port type  Video Port
connector  DB-15 female
DMI Port Connector
designation  J3A1 (internal)
designation  USB1 (external)
port type  USB
connector  Access Bus (USB)
DMI Port Connector
designation  J3A1 (internal)
designation  USB2 (external)
port type  USB
connector  Access Bus (USB)
DMI Port Connector
designation  J3A1 (internal)
designation  USB3 (external)
port type  USB
connector  Access Bus (USB)
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DMI Port Connector
designation  J6C2 - EXT HDMI (internal)
DMI Port Connector
designation  J3C1 - GMCH FAN (internal)
DMI Port Connector
designation  J1D1 - ITP (internal)
DMI Port Connector
designation  J9E2 - MDC INTPSR (internal)
DMI Port Connector
designation  J9E4 - MDC INTPSR (internal)
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DMI Port Connector
designation  J2G1 - GFX VID (internal)
DMI Port Connector
designation  J1G6 - AC JACK (internal)
DMI Extension Slot
designation  J6B2
type   A5
populated  yes
DMI Extension Slot
designation  J6B1
type   A5
populated  no
DMI Extension Slot
designation  J6D1
type   A5
populated  no
DMI Extension Slot
designation  J7B1
type   A5
populated  no
DMI Extension Slot
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type   A5
populated  no
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string[0]  DK20A
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location  Motherboard
usage   System Memory
correction  None
max capacity  32768 MBytes
max# of devices  4
DMI Memory Device
designation  A1_DIMM0
format   DIMM
type   unknown
total width  64 bits
data width  64 bits
size   4096 MBytes
DMI Memory Device
designation  A1_DIMM1
format   DIMM
type   unknown
total width  64 bits
data width  64 bits
size   4096 MBytes
DMI Memory Device
designation  A1_DIMM2
format   DIMM
type   unknown
total width  64 bits
data width  64 bits
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hey skimore,
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http://www.lenovo.com/psref/pdf/icbook.pdf
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thermostat wrote:
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