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I have a IGT S2000 that has a Netplex display link down message, tried both power supplies to no avail. Machine did this following a power surge,. Any ideas on what to try next?????

If you have already swaped out the power supply, with another known working one, then you should probably try swaping out the MPU, and see if it goes past netplex link is down into testing memory. 

Thanks Brian we'll see what happens!!

You may also try your seven segment board.  It is part on the netplex channel and can cause some grief.  Usually when that is the culprit it generally will show the failure, reboot, and continue in that cycle

Im having the same problem with slingo jackpot.its saying netplex display link down. Do you have any idea how to fix this problem? I tried power supply an still wont go away

Has the machine ever worked or did you get it this way? You can try and force a netplex configuration in menu 4 and see if it helps

Check the green battery, the last time I had a netplex down message it worked fine after I installed a new battery. The battery on your main board may be below 3.6 volts

Yes it worked and Ill go change the battery right now and give a update. thank you

Also, a failing power supply will throw this error.

What worked?

I thought he meant "Yes, it worked" to the question of "Has the machine ever worked for you?"

Yes it has worked.it was shut off an when turned back on the display netplix link down appears..i changed power supply and now battery on cpu an still no change

Heres a picture

Have you tried forcing a netplex configuration in steep menu 4

No. How would I do that. Im not very familiar with this type of game

Try this first:
   Firmly press in the MPU to make sure it is fully seated in the machine.

if you know how to get into the menus Netplex auto configure is in 4 I/O tests

Press the button on the MPU
Press the Cash Out button three times to go to 4 i/O tests
Press the Spin Reels button once to enter I/O Test menu
Prees the Cash Out button two times 
Press the Spin Button two times machine will re configure all netplex devices
Press the Max Bet button until you exit the menus

If You Have the WRONG I/O Board In the Door--Netplex Link Will Show "Netplex Link Down"
Make Sure I/O Board Matches The Buttons.
Board Could e Bad---Also
DAVE

SENET and NETPLEX are 2 different interfaces

All Door and Cabinet I/O Boards are on the SENET bus
Door devices connected to Door I/O:
All player buttons, Coin handling (comparator, optics, drop diverting solenoid) multi-line lamp and most likely other multi-line displays
7 Segment display is a separate SENET device, the 6-6-3 also has the touch pad interface chips.

Cabinet devices connected to Cabinet I/O:
Jackpot Bell, Hopper, Handle, physical accounting meters, W-2G jackpot switch, Candle
Back lighting controller is also a separate SENET device (the connector on the I/O card is a pass thru connection)

Aux SENET (in top box) 7 Segment Progressive display and other optional devices.

Netplex bus devices
VFD, Bill Validator, Printer, Spectrum I or II Progressive

Additional devices can be either SENET or Netplex depending on how IGT wants to interface them to the MPU

A clue that something is on the Netplex interface is the data wire colors are green with stripe on them
Look at the VFD and the BV harness from the machine

SENET uses different colors.

I have a flashing red light on mpu and the fourth led on mpu blinks with red light at same time and then goes away

In my experience, it sounds like you have a bad MPU. I had a couple bad ones that gave me the same kind of errors and had the red light on the board. I tried replacing just about everying in the machines with known good parts and the only thing that fixed it in my situation was a new MPU.

thank you i will try that

I had the same problem , I replaced the green varta battery 3.6v on the mpu board and it worked. if your MPU board displays red light the replace the MPU board and check if the green battery on the new board is 3.6v.

That would only matter on a 1270 board. The 500 series don't need that battery anyway. Unless of course it was shorted, then it could hurt a 500