Build doesn't start. Motherboard outdated. What to buy?

[HigginsHEre]

Hi I built a computer for my dad with a few old but presumably good parts. However, after not starting, a repair shop told me something like the motherboard cannot handle the newer power supply. Ideally I would like to be able to keep as many current parts as possible. What should I buy? What's the best value option? Low budget, just looking for parts to get the computer in working order. Bells and whistles unnecessary. Thank you!

Bulid:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-3570K 3.4GHz Quad-Core Processor (Purchased For $80.00)
Motherboard: ASRock - Z75 Pro3 ATX LGA1155 Motherboard (Purchased For $40.00)
Memory: Mushkin - Silverline 8GB (2 x 4GB) DDR3-1333 Memory ($55.89 @ OutletPC)
Storage: Kingston - SSDNow V300 Series 120GB 2.5" Solid State Drive ($79.89 @ OutletPC)
Storage: Hitachi - Deskstar 7K1000.D 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For $0.00)
Video Card: HIS - Radeon HD 7770 1GB Video Card (Purchased For $30.00)
Case: Deepcool - TESSERACT BF ATX Mid Tower Case ($36.99 @ SuperBiiz)
Power Supply: Corsair - Builder 500W 80+ Bronze Certified ATX Power Supply ($53.98 @ Newegg)
Operating System: Microsoft - Windows 10 Pro OEM 64-bit (Purchased For $0.00)
Total: $376.75
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-06-21 16:55 EDT-0400

 

[USAFRet]

a repair shop told me something like the motherboard cannot handle the newer power supply

i5-3570k
ASRock Z75 LGA1155
Corsair 500W

The repair shop is clueless.

There is a whole different reason as to why it is not starting up.
Go through all of this:
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[HigginsHEre]

a repair shop told me something like the motherboard cannot handle the newer power supply

i5-3570k
ASRock Z75 LGA1155
Corsair 500W

The repair shop is clueless.

There is a whole different reason as to why it is not starting up.
Go through all of this:
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

Seems you're right. So far I've determined that one of my sticks of ram is dead. Thank you.

 

[USAFRet]

Seems you're right. So far I've determined that one of my sticks of ram is dead. Thank you.

OK!

They just didn't want to spend any time diagnosing, and wanted to sell you something new.