I recently bought a Supermax ycm-40 mill with a Centroid M-50 control from my boss. It ran fine before sitting through a colorado winter in sub-zero temperatures. When I got it to my house, the hard-drive failed, so I ordered a flash drive with IDE interface from Centroid for $395. Not a bad price really. The drive came with the latest version of CNC7 and Intercon that the machine's harware is compatible with (I had to give them the serial # so they would know exactly what to give me).
I then replaced the aging PC power supply, all the fans, and Installed a 15" LCD monitor. The system powers on and the PC boots up just fine.

HERES THE PROBLEM: When the CNC7 software tries to load, It says "No response from DSP" and then exits into DOS with error code 63.

When I look at the status LED's, I can see there is something wrong. All power supply LED's are lit indicating correct power even though I do not have the 3rd power phase connected (I haven't got a phase converter yet). But the control only runs off of the first two phases anyway- only the spindle and coolant pump need three phase.
On the RTK2 board (servo amps and I/O controller) The Out16 led is off(normal) and the OE and Shift LED's are lit. The manual says this indicates a problem with the CKS fiber optic link to the PC board. I checked it and its fine, but there is no light on at either end of the link.
On the Servo drive, DF, UV, and USV LEDs are off (which isn't normal), but the manual says these will be off until the CNC7 software is running.. which it isnt.
I took off all connectors and cleaned them with contact cleaner as recommended every few years, but that did nothing. I swapped one of the other optic links that does have light, with the CKS link, but that did nothing. I tried loading the original PLC config file that came with the machine, but that also did nothing.

Like I said, the machine worked fine before installing the new flash drive and software.

I realllllly don't want to have a Centroid repair guy come and charge me an arm and a leg because of some stupid setting or something-- I don't own a shop yet so I don't have that much money to blow. I still only make machinist wages!
Your ideas are much appreciated.