If the 8500 is the same as the 9500 disassembly is as follows:
1. Unscrew the 6 large screws on the back of the case, then slide the main case forward an inch or so then lift it off.
2. Remove all PCI cards and the processor card
3. On the right side of the machine as you face the front there should be a screw in the center of the motherboard; remove it and the plastic molding covering the MB (if there is one).
4. Disconnect all cables on the MB edge, the pop the front on/off switch assembly forward a little.
5. The MB should then slide forward about 1/2 inch and come right out; don't forget the cables for the fan and front switch.
Assembly is obviously the reverse steps.
1. Unscrew the 6 large screws on the back of the case, then slide the main case forward an inch or so then lift it off.
2. Remove all PCI cards and the processor card
3. On the right side of the machine as you face the front there should be a screw in the center of the motherboard; remove it and the plastic molding covering the MB (if there is one).
4. Disconnect all cables on the MB edge, the pop the front on/off switch assembly forward a little.
5. The MB should then slide forward about 1/2 inch and come right out; don't forget the cables for the fan and front switch.
Assembly is obviously the reverse steps.