Server part replacement

I am in need of a server part replacement for my current system. The part needed to be replaced includes an HDD RAM Motherboard Array. I’m not sure which exact power supply should be chosen, so I’d like someone to recommend something compatible for me. I need this replacement to happen within the next week, so I’m looking for someone who is available to complete the job as soon as possible. If you think you have the skillset and availability for this task, please let me know. Thank you.