Does your designjet have "Boot Failed" Error? 
Your power supply is the problem check that both your GREEN light and ORANGE lights on the main logic board right above the RAM are both bright if the Green light is not bright and looks very dimmed just like it shown on the pictures then you have a bad power supply, This fix will help you save $200 to $400 on a used or new power supply and sometimes when you purchase a used power supply there is no guarantee that your power supply is going to be any better due to how old these printers and get the same issue, this kit has been tested for over 5 years and we still run printers with this kit and it has saved clients hundreds of dollars, 
So if your Green light is not as bright as the Orange light and you get a Boot Error this is your fix. 

We will send you the item with everything you need to get it back runing in less than 5 minutes time. no soldering no mess get you printer runing Fast. 

"Please Read before buying"
Due to our time and dedication on fixing this machines and finding different alternatives to fix them
we learn better ways to save our costumers money, over $200 of savings with this fix.
We Do not offer Returns For this Service
"Please do not buy if what you are looking for is a brand new  or used power supply 
this in not a OEM power supply, this is just a fix for the problem"
So please before you buy be sure that your problem is listed in the description

Thank you for your time!