This trick got me two i7-4600U IPS FHD Touch E7440’s for $98/unit* - one sadly needs a screen (bad backlight) and neither sold with a battery, SSD+cable/caddy or RAM (although I did rummage up some 4GB DDR3L modules), so I may not be able to economically repair the bad unit :(. That said, the one with a good LCD is ready as soon as I buy a battery and a HD caddy+cable, and possibly put a matched RAM set in. I’m recycling an SSD from another machine.
*Covid market - even desperate parents didn’t want to touch that gamble for their kids for Zoom school. It's because the possibility of a bad board is very, very real.
Pull the CMOS battery for 1-2 minutes and try to boot without it. If it boots, the CMOS RAM was corrupted. If it doesn’t, confirmed bad motherboard. It’s not like this isn’t known, so I don’t mind revealing it. The issue is some Dell laptops are sensitive to CMOS corruption moreso then others. The E7440 is a 2-in-1 special: it hates booting with CMOS corruption (which isn't entirely uncommon) and it's somewhat voltage sensitive. I suspect your Vostro is in that same group.
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