I highly doubt one could get any cerification on a 9020 from Dell.  I can't speak much for Amazon in regards to warranty policies except they typically have a 30-day return policy on many items.

"certification of initial defect in the item received" - Not making sense to me.  Stall tactic?  See, it sounds like they expected a document to come with it certifying a defect when you bought it.  But you bought it with the expectation everything was working.

I'm a bit surprised Amazon didn't refer you to the vendor that sold it to you thru Amazon.  How long have you had the 9020?

As for an Amazon exchange or return, there's little we can do to help with that.

"sounds like they expected a document to come with it certifying a defect when you bought it. But you bought it with the expectation everything was working"
Exactly, doesn't make much sense to me either, but I thought maybe it's just some official document with a confusing name... Amazon suggested addressing the seller too which I did and got rejected since the warranty was already off (1 month only).  After that Amazon offered that A-Z guarantee but seems they need that weird document, for that.

I own this PC for about a year now but it only worked ok 1 or 2 months. After that described problem occurred which I first tried to fix using software methods like Windows reinstall, before writing here.

I'd rather see you have a working PC.  But one idea if it won't work out is to sell it on eBay for parts.

May I confirm couple things

The motherboard power switch pins - is there any way to find out where they are located, on MB? Not only I do not understand PC hardware at all but also have bad sight and without some location can search forever...

And one more thing - if I will have to replace MB shall I have to reattach CPU cooler? That would be the hardest part for me I believe as I heard this is quite a delicate process with some special grease used or something...

Thanks!!

PSU new but system shows same power on error. Test jump start to rule out power switch cable issue between power button and actual 5 pin power switch on motherboard.

Yes I shall try it, only, I do not know where this switch is located so I tried to do some search which was half successful

Am I right that on this pic it's #6?

If yes - I can't find a better picture for more details, and I have not ok sight so those 2 exact pins I need to connect - are the lowest ones right? (if you look at the picture above)

And also am I right to understand that PC power (adapter) cable should be connected? And then instead of pressing power button I use a screwdriver to connect those pins?

Sorry for questions, I am very bad with all this hardware...

This is 9020 mt power switch on motherboard. Unplug the Pwr sw cable for this jump start test.  Short the two far left pins temporarily by a flat blade screw driver.

The yellow and black cables are contacting the two far left pins of the power switch

reference

Thanks for details!!!

Managed to try that jump start test at last. Took about an hour to figure things out and when almost gave up could do it at last. Result: still need few attempts with screwdriver to start PC. Funny thing is that it seems it's always only I attempt needed to power PC off; but to start PC, I still have to short pins w/screwdriver for several times.

Also tried memory 1 by 1, also changed the slots ( have 2 memory modules and 4 slots). Nothing helped.

Seems the only way left is to change the memory board? Or is there something else that can be done? Because, MB costs around 3/4 of this PC price, in my area. Not reasonable. Also if I'd have to re-attach CPU that would be too much of risk, for noob like me.

BTW my MB doesn't look like the picture you attached, in above comment.Does that matter? Maybe MB was changed and therefore doesn't work, properly? I have taken some pics so can attach it here. Or maybe there's a way to see MB model somewhere in system properties. If that matters...

maybe keep the pc powered on all the time and just let it sleep but not powered off when you walk away to save the trouble of starting the board. Not worth buying replacement board.

"Seems the only way left is to change the memory board? Or is there something else that can be done?"  No.  And MB (motherboard) certainly isn't worth replacing (as redxps630 mentioned) if it costs 3/4 of the PC.

"BTW my MB doesn't look like the picture you attached..."  Redxps630 specified that the image was for a "9020 mt" (mini tower).

Thaks again for replies.

Yes I won't buy replacement MB.

I used hibernation a lot because need to save some info. But then I can't start PC normally, same to regular power off. Sleep mode seem to work ok in terms of starting, but power light keep blinking all the time, and I guess it still consumes some power and not sure it's good for PC to use it long term. As a temporary fix might be, but always...

So means there are no more things to try?

One more that I wonder about is that if I unplug the PC's adapter cable (black thick cord in the back of the PC) and then insert it back in, PC seem to start ok immediately. It like starts, shuts down, and starts again and runs. Tried couple times, both work. Not sure if it's ok for PC to start it like this and not convenient way either but it seem to work without errors. Could it give some other clues to possible solution?

It sounds like in BIOS Power Management settings PC is set to power on when power is introduced   One idea would be to have it plugged into an outlet strip.  Use the switch on the outlet strip to turn it on.  Not the most recommended way to do things, but if it works...  Still use Windows to shut it down.

That routine of PC powering on for just a few seconds when power is introduced is normal for Dell's.

As for the 9020, we ran the mill with it   Only a couple of ideas left as mentioned would be to sell it for parts or sell it as individual parts.  And as redxps mentioned, would have to live with it without replacing the MB.

Thanks. Yes some kind of selling... Nah

My bad about power cable btw - later I couldn't repeat it. Only worked two times but not anymore. So several power button presses or sleep mode...

May I confirm one more, just in case - technically, can this be a software problem?

I thought so at first because this PC was in Japanese originally so I changed it to English (Windows 10). As I recall problem occurred soon after that so I thought that was the reason. Tried some reinstalls which did not help but now I wonder if restoring PC to its original (Japanese) version would do the trick?

Or, software has nothing to do with it.