820-2366 white screen

I received a Mac mini 2009 that chime but It only show white screen. Plug in an external hdd I can see that I neither try read the hdd or load the os, it's like it stucks after chime, even if I press ALT nothing show on screen.
I tried to change ram, installed another bios, changed lcd cable.
When the customer bought it to me it didn't load OS, neither with another hard drive. I wasn't possible to select hard drive boot by pressing ALT, it could only boot with internal hdd.
 

dukefawks

Administrator
The only option here is the BIOS, if that does not fix it I have no idea. Make sure to use PC8500 RAM only. Can it do a PRAM reset?
 
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