820-2850 Flashing folder

Hi I received a board with a missing display connector. I replaced it with a new one. Yesterday it booting fine. But today it’s not boot in to any hdd or OS X. I’ve swapped it twice with two hdd and two SATA flex cables know good. Checked the fl4510 and caps c4511,c4510
I have 5v at SATA connector pins 9,11. The fl4510 has continuity from terminals 1-2, 3-4. The u4510 area is spotless. SATArdrvr_a_en =3.4v
Smc_odd_detect =3.3v
at r4590 I have a value of 20k ohm and the schematic says 33k.
Lastly it won’t pram reset and it also has a weird issue that it won’t respond to power key from time to time while powering on but will always power off with no issue if that means anything. I also swapped it with another keyboard and power button. Just to be sure.

Can you boot from USB OSX?

I will have to make a new usb tonight.
Let me ask you. I have a OS X Lion disk handy Will that work In the meanwhile? I understand that the dvd/hdd might work together but maybe the dvd drive can help me diagnose? Both the dvd drive and hdd drive spin up.

You can try to boot from DVD disc, if available...

Ok so I tried a usb and boot disk it won’t boot. When I hold option key it has a efi lock :/ would this give me my symptoms ?

I have a programmer. do you think a clean bios would fix this :/ I’m assuming I would just replace the password with the code inside a clean bios would I be correct in thinking I could use the blank code it basically a “place holder” to flash efi lock ? I’m sorry I never encountered this problem the salvage company says they don’t have it.

Ok it worked. How can I test for the kernel panic issue this board suffer From?
Like what does it do ? I have another one of these from the same company. But it’s missing pm_slp_s4_L. I will start a new. Thread for that one

Now boots and get kernel panic?

No it doesn’t it seems to run fine but I was wondering how would I test for a kernel panic ? I looked it up on the internet and it say no video or video issues and freezing. are there any other symptoms? By the way thanks a lot for your help

Change C9560; do NOT use hot air...

Thanks informatico it wasn’t kernel panic Ming but why risk it I just switched it out
Thank you for your help