I have a dell xps that came in with no power issue, i found that cap on1.05v_vcc was short and resistor was burnt down, i reported it and got that voltage back, now when i press power button, its keyboard backlight comes up, but there is no display at all, then i checked vcc_gfxcore line and it was missing. Did some online research and found that gfx core comes up after board have completed posting, i have flashed bios and ec firmware, but nothing changed,