Dell 7280 weird intermittent power issue

Jet-Fighter7700

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so want to check maybe there is something I need to still do here, as its really odd, makes no sense.

this is my Personal Lappie, dont use it all that much, but when I want to use it it refuses to turn on, (POST)

no lights, hold the power button to do a battery drain does nothing, plugging in the AC adapter (90W large pin) , plugging it in to a Docking station,
unplugging/re-plugging battery, literally acts like a brick,

but took it in to a repair place, and even they couldn't figure out whats wrong with it, did manage to get it to turn on, ran diagnostics, switched it on and off a few times, all went well, but then about 3 or 4 days later, same issue, went back, again, got it to turn on like nothing happened, worked perfectly for 3 or 4 days,

then again, wont turn on,
they cant understand it, neither can I,

Googling the problem, leads me to motherboard issue, daughter-board issue battery issue, and a whole bunch of other things that make no sense, and its really intermittent, as I type this, earlier it turned on, but no display, but did have lights, but eventually turned off,

now push the power button, nothing, before I take the back panel off and try again, unplug/replug and try battery drain with/without power, with docking station/with ac adapter to see if I can revive it,

wanted to ask what to try next? worth taking to a board level place, or somebody really specializing in these compact Dell Lappies
 
I have a Dell 5400 and it also has this weird issue where if you don't use it for a week or two sometimes it will refuse to switch on unless you first plug in the charger, then it'll switch on no problem and you can pull the charger out and still have like 80% battery life so it's not the Battery issue per say. When I googled the issue while back it's a known issue with some Dell laptops
 
Have you tried the built in diagnostic mode if you get it to startup. You keep hitting the F12 key when the Dell logo comes up. Could also be your power button is dirty inside and doesn't make proper contact. You can clean it by spraying switch cleaner or aerosol alcohol sanitizer on it.
 
Could it be as easy as a damaged/poorly connected power button?

Sounds like a laptop i'd keep in sleep mode 100% of the time, barring the occasional restart.
 
It's Dell. It's always the motherboard.
what part, or is it just generally crappy in general, as it seems to do it completely randomly,

right now if I take it apart, remove the RAM, unplug the battery, plug the charger, and then try,
nothing,

I'll take it to a repair shop, try turn it on, nothing,

repair guys will try something, will work for a week or so, and then stop turning on,
 
what part, or is it just generally crappy in general, as it seems to do it completely randomly,

right now if I take it apart, remove the RAM, unplug the battery, plug the charger, and then try,
nothing,

I'll take it to a repair shop, try turn it on, nothing,

repair guys will try something, will work for a week or so, and then stop turning on,
All I know is whenever Dell comes out to fix my laptop they put a new motherboard in. Whether it is the ram, CPU, GPU, USB port, power button, whatever, they just relace the motherboard. They don't trouble shoot anymore or have technicians, they have part replacers. When they replaced it for the 3rd time within 3 months they give you a new laptop. Of course once we are out of warranty we are screwed.
 
Have you tried the built in diagnostic mode if you get it to startup. You keep hitting the F12 key when the Dell logo comes up. Could also be your power button is dirty inside and doesn't make proper contact. You can clean it by spraying switch cleaner or aerosol alcohol sanitizer on it.
doesn't even get to that stage, no lights no power at all right now.
 
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