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hello. please help me fix this laptop. ​after power on everything works but nothing shows up. some times after 10 or more power on finally it gives the display. but after a restart it dies again. i have tried this: -connected laptop to ​a monitor through VGA output, but nothing showed up. -i removed ati graphic chip from the main board using hot air gun in order to force the laptop to use cpu graphic. and still nothing shows up. -cmos battery gives 3v properly. -i replaced cpu, ram and hard disk. ​and now out of hope i’m seeking international help and advise.​ - Please help me out! i have a multimeter, can someone tell me where should i look???

I don’t know what to tell you, it sounds like you’ve done everything I could think of. But, there is one on ebay. You could swap the hard drive, or use an Ada to usb adaptor. https://www.google.com/search?q=Samsung+