How do I find the correct power supply part number for my Mac Pro?

Because the moderators redacted your serial number, we are stuck. On the label where you found the serial number should also be a model number. See if you can find that.

If you only have the serial number, consider a non-Apple lookup site that is not a forum setting with millions of users. That function is here:

https://www.powerbookmedic.com/identify-mac-serial.php

or here:

https://everymac.com/ultimate-mac-lookup/

Hi,

Which model of Mac Pro you have?

Following pats number could help your question.

Mac Pro (2009–2012, Classic / 4,1 and 5,1) - 980W

• Apple Part Numbers (APN / Service): 661-5449, 661-5011
• Printed Part Numbers (PPN / MPN): 614-0454, 614-0435, 614-0436, 614-0455
• OEM Model Numbers: DPS-980BB, DPS-980BB-1, DPS-980BB-2 A, FS8001

Mac Pro (Late 2013, "Trash Can" / A1481) - 450W

• Apple Part Number (APN): 661-7542
• Printed Part Numbers (PPN): 614-0521, 614-8521
• OEM Model Numbers: ADP-450AF, FSD004

Original Mac Pro (2006–2008 / A1186) - 980W/1000W

• Apple Part Number (APN): 661-4677 (First Gen), 661-4406 (2008)

if you can not easily find your required power adapter from this apple article, Readers can help you identify which model you have and which power adapter would be required and available.

Use a power adapter with your Mac - Apple Support

¿Do you indeed have a Mac Pro desktop?

¿How did you decide its power supply has failed?

(There may be other symptoms related to power that can be solved by solutions that fall short of replacing the supply.)

Mac Pro is a 42 lb desktop computer with an integral power supply, about 20 inches tall.

I will suggest to the Moderators that this discussion be move to the MacBook Pro discussions area