I am using 3 nema 17, a power supply of 24V (lrs-350-24), 3 drv8825 with a cnc shield attached to a arduino uno, all the drv are set to a vref of 0.75. I already tried multiple code and multiple solutions but nothing worked, can someone please help me?
First aids is this link: How to get the best out of this forum - Development Tools / IDE 1.x - Arduino Forum
It tells What You need to post, and how.
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I expect you will get a bang, look at your mains connection to the power supply.
Hi, @etbuosi
PLEASE FIX THAT CONNECTION!!!!!
AND CONNECT AN EARTH!!!!!
Can you please post your code?
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Can you please post a link to data/specs of your stepper motor.
Are you using the drv8825 library?
If so have you tried the Example DRV8825_test?
Tom.... 
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