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MacBookPro no start, no chime, fan spin, no display

Vengeance1020
By Vengeance1020
in Troubleshooting
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I have an old MacBookPro which I am working on repairing, With battery it will power on for a few seconds and then power off, on AC it will do the same but then reboot and stay on
All Power Rails I have checked so far seem to be working (S5-S0) and Power is being delivered to CPU, NB, SB, and GPU. USB power is present as is SATA power
No beep codes with memory removed, memory power is supplied

Am wondering if its NB, possibly a short

I am lost as to how to continue since I don't have anything to go off of as to what could be wrong. Everything seems to be initializing just fine but POST does not succeed

 

Thoughts?

Main system "Kethlon":

Core i7 3820 - Intel Desktop Board DX79TO - 32GB 1600MHz DDR3 RAM Dual channel - EVGA GTX 1050 Ti SSC - EVGA 550 B3 - PNY 120GB SSD (boot),WD Blue 1TB (Mass Storage)

See profile for full specs

 

Primary Laptop "Vengeance":

HP HDX16 1370US - Intel Core2Duo P8700 - 4GB DDR2 800MHz RAM Samsung - HGST 1TB 7200RPM (Windows 7, Linux, MacOS 10.11.6) - Nvidia GT 130M 1GB DDR2

 

Downed Laptop "Xarasky":

MacBookPro3,1 - Core2Duo T7700 - 4GB DDR2 RAM 667MHz - Nvidia 8600M GT 256MB VRAM - 640GB HDD (MacOS and Windows)

 

Testing laptop #1 "Leonard":

HP 15 F387WM - AMD A8 7410 APU - 8GB DDR3 Samsung RAM 1600MHz - AMD Radeon R5 graphics (1GB VRAM partitioned out of physical RAM) - 500GB WD Blue mobile drive

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3 minutes ago, PineyCreek said:

Check out Louis Rossmann's channel on YouTube.  That's pretty much all he does.

I have been watching his videos but nothing seems to give me any insight as to what this board is doing

Main system "Kethlon":

Core i7 3820 - Intel Desktop Board DX79TO - 32GB 1600MHz DDR3 RAM Dual channel - EVGA GTX 1050 Ti SSC - EVGA 550 B3 - PNY 120GB SSD (boot),WD Blue 1TB (Mass Storage)

See profile for full specs

 

Primary Laptop "Vengeance":

HP HDX16 1370US - Intel Core2Duo P8700 - 4GB DDR2 800MHz RAM Samsung - HGST 1TB 7200RPM (Windows 7, Linux, MacOS 10.11.6) - Nvidia GT 130M 1GB DDR2

 

Downed Laptop "Xarasky":

MacBookPro3,1 - Core2Duo T7700 - 4GB DDR2 RAM 667MHz - Nvidia 8600M GT 256MB VRAM - 640GB HDD (MacOS and Windows)

 

Testing laptop #1 "Leonard":

HP 15 F387WM - AMD A8 7410 APU - 8GB DDR3 Samsung RAM 1600MHz - AMD Radeon R5 graphics (1GB VRAM partitioned out of physical RAM) - 500GB WD Blue mobile drive

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