Inspiron 3650, turns on then turns off

Hi Michael0921,

Thanks for posting.  Apologies that your system is not performing as expected.

Have you tried reseating everything?  Memory, output cards, etc?

If that's still not working then there is the possibility of a motherboard failure.  

Here is information from the Dell Knowledge Base you may find helpful:

How to Troubleshoot a No Power Issue on your Dell Desktop

If the system is under warranty, please contact me privately. Be sure to include your personal information (name, address, telephone, email) and your computer's service tag number in your message. Thanks.

If there is no warranty, then you could contact our Out of Warranty team to get a quote for a paid service call -

Watch this short video: https://dell.to/2WaTXen; You can do this with all the plugged in components.  Try removing the ram all together, then put them in one at a time to see if the system will boot.

How would I go about resetting all those things?

Click on the link that Robert has posted for more information. It sounds like a memory problem is possible but you say that there are no flashing diagnostic lights and no beeps, is that correct? To reseat the RAM or video card, first turn off power, and unplug from the wall. Then remove the RAM modules and reinsert them making sure they are fully inserted in the DIMM slot. Do the same with the video card. Careful with the video card as there is a latch that needs to be pushed back so the card is not locked in. The link below from the service manual has instructions.

https://www.dell.com/support/manuals/us/en/19/inspiron-3650-desktop/inspiron-3650-desktop/procedure?guid=guid-ebb01ee1-ca6b-43d8-b26a-4bac20a41e12&lang=en-us

https://www.dell.com/support/manuals/us/en/19/inspiron-3650-desktop/inspiron-3650-desktop/procedure?guid=guid-6c593358-38bc-4503-ba80-9e2f2a62a6d1&lang=en-us

One more question. You say you replaced the motherboard CMOS battery. Did you wait 15 minutes after removing the old battery before installing a new battery?

Robert obviously aced the typing class he took.. faster than my feeble attempts. Follow his video.

Correct, no Amber light, no flashing and no beep.

I didn't wait 15 minutes and then turn the computer on.

Though when it did the same on and then off I turned it off then remover everything.

Ram, GPU, and mother board battery.

I am at work so they have been unplugged for about an hour once I return from work in about 5-6 hours I will try it again.

Then update the situation.

So came back from work and it did the same thing.

Idk what it could be.

My guess now is either the mother board or the processer got fried. I honestly don't know.

Some more info on this problem, which I forgot to mention.

My computer started slowing down/lagging. Like extremely bad. I was in the middle of a lol game (the moba game) so I thought it was just frame drop. So I closed it and it turned out that my whole computer OS and everything was experiencing the same thing so I then force shut it down. Then this problem started happening. 

But when it had the old power supply (OEM) one it just a a blinking Amber light.

Once I got this new one the Amber light disappeared. Now it does this one and off thing.

Michael,

With this new information the issue has now become outside the scope of my team.  Please follow JOcean's advice from this point forward.  (PS: If the new power supply did not come from Dell, there's still the possibility it may be suspect.)

Could it be overheating? The entire OS would run slowly if the CPU clocked itself down because of heat and prevent it from getting fried.

Are all fans correctly connected and working?

You might want to think about removing the heat sink from the CPU, cleaning both surfaces and applying a thin coat of fresh thermal paste (eg, Arctic Silver), and then reattaching the heat sink. (Do not remove the CPU from its socket.)

On some newer PC models, the PSU fan only turns on when it's needed, unlike in the old days when the PSU fan ran constantly. Not sure about this specific PC model but something to keep in mind.

There are lots of youtube vids about cleaning off old thermal paste and applying fresh paste, if you need any help doing that.

Some vids may suggest using alcohol so use it carefully. Don't let it drip inside the PC if you use it to clean the top of the CPU.  And don't use "rubbing alcohol" which is only 70% isopropyl alcohol and 30% water.

This does seem logical.

I check all the fans and the we're working properly except the fan in the (OEM) PSU.

So I did remove the CPU cooler. And notice the heat sink was very weak. So I am going to get termal paste and fully clean of the old paste and reapply then try. Also they cooler it self did have some dust bunnies.

Will update the thread one I do this.

Thank you for the suggestion also the heads up about not removing the Chip itself because I was going to. 

It's just a infinite loop.

On the turns itself off then back on rinse and repeat.

So I cleaned the thermal paste and applies some new paste put everything back together and no dice.

Just turns on for about 5-10 seconds and then just turns off.

I guess this computer is donezo.