TomGeorge:
Hi,
This diagram is weird, what are the green lines doing?
Tom.... :o
I deleted the lined from the LEDs to the third shift regeister en connected them to the first shift register.
Hi,
Have you looked at my suggestion in post #17?
Have you written code just to get the first 595 connected and working?
Then added the next 595 connected and got that working.
Then added the next and the next, each time getting the code to work before continuing.
If not I suggest you do, so you can prove your code is working at each stage.
Tom.. 
Nielska:
Well, this is something weird. I tried connecting the 'green' LED's to the first register and they don't light up.
Ah, so the RED LED's did work when connected to the first shift register, but the GREEN ones don't ?
Since your code looks ok and the first shift register was working, it is possible that all the shift registers are working but the LEDs are not connected correctly.
Could be:
a. the GND connection to the GREEN LED's
b. the GREEN LEDs are the wrong way round
Try: unplug one green LED wire from the shift register and touch it to the 5V line - the LED should light, if not then check the GND connection, then try turning the LED round.
Yours,
TonyWilk
Hi,
Do you have a DMM?
Tom...
TomGeorge:
Hi,
Do you have a DMM?Tom...
Yes
Hi.
Have you checked the 5V supply to ALL the 595s.
Check for connectivity to the 595 pins, with the power OFF.
Does your protoboard have a break in the red/blue or red/black line down the side of the protoboard, ie the power bus lines?
Can you post a picture of your project please?
Thanks... Tom..
It's fixed, apparently there is a broken connection in my breadboard. Thanks to all of you who were willing to help me.