IMac wont turn on after connecting USB from Computer to USB on Printer

[jamielee143]

I'm hopin someone can help me, I have a 2017 IMac 5k 27" 2TB Intel Core i7 that won't turn on. I spent $4,200 on it less than 2 years ago n it's out of warranty. I took it apart, I think it needs a new logic board but I have no idea what logic board I need or if thats even the right part. I replaced the power supply thinking that may have been the issue but no such luck. This whole thing happened because I'm an idiot and I used the wrong cable to connect the computer to my printer. The printer wifi wasn't linking all the time so I thought buyin a usb to usb cable would help not realizing I needed a special cable to go from the back of the printer to the computer usb. Well, as soon as I plugged the usb cord from the printer to the usb cord on my imac they both shut off. No lights on either, no nothing. I tried the hard reboot and that didn't do anything So, It appears I may have fried both devices. I I started replacing parts on the imac, first starting with the power supply with no luck. Do you have any advice ??? I have 4 kids and can not afford to buy another computer and the computer place in my area wants a $800 deposit. I took it to Best Buy and they said I'm better off buyin a refurbished computer because the cost to ship it to apple is more than a refurbished computer. I work from home so I need to fix this.

 

[Fishrrman]

My opinion only, but it's not such a good idea to be taking 4,200 computers apart unless one really knows what one is doing (and yes, this advice applies to me, as well !).

If you've "gone as far as you can go", looks to me like your only option is to take the iMac to a "repair person" and see what they can make of it.

You aren't telling us where you are in the world, but I would take it to a brick-n-mortar Apple Store genius bar and see if they could work on it. They can get it running again -- although the cost might not be worth it.

If you decide it's time to buy another one, I WOULD NOT spend upwards of 4,000 on a new iMac.
I'd buy a mid-range 27" Apple refurbished model with 8gb RAM and a medium-sized SSD (512gb).
That should come in around 2,000.
Add RAM yourself. Apple overcharges and adding RAM is easy on the 27".
Get an external SSD for additional storage. Don't pay Apple's high prices for large-capacity internal SSD's.

If you have a printer that has an ethernet connection, that's what I'd recommend using.

 

[TwoH]

Do you get any of the diagnostic lights on when you plug a kettle cable into the iMac?

Good choice on trying to swap the PSU out first though.

 

[jamielee143]

Do you get any of the diagnostic lights on when you plug a kettle cable into the iMac?

Good choice on trying to swap the PSU out first though.

Thank You so much and No ... No lights whatsoever