Computer won’t turn on for good

[Uncrow]

A few months ago I got a computer which gave me trouble with the keyboard an mouse as they were not responding unless I was in the bios, since then I did 2 things, first I removed and put back the battery in the motherboard then I changed the HDD with an SSD, to be honest I cannot ensure which of those two is the cause of the problem but I recently got back to repairing the computer and I found out that now it just doesn’t turn on anymore at least he turns on but for 1 sec before turning off and repeating the cycle.

By the way if that matters the computer is a optiplex 790, the SSD is a crucial BX500 2.5 of 480GB

Here is a video showcasing the problem and the inside of the computer : https://streamable.com/uybqkd

If you need anything else, I’m there to answer !

[veeg]

Hello

It may be two things the power button is faulty and or the psu .

Let’s get more eyes on this.

@PeterOz

[Bruce]

it’s rebooting every 5secs, which is inline with the power button being held in to force a reboot.
so yeah, disconnect the power lead from the front panel header on the motherboard and to start, short out the PSW SW pins.

could also be memory, so remove both, clean their circuitry, and their contacts and their motherboard slots with a soft bristled brush.
reseat one of them and try that. if still an issue, swap to the other memory stick and try again.

also, disconnect anything not required to start the PC, so unplug that DVD unit for starters.

[Uncrow]

Ok ! First of all thanks for all of the advices guys !
I’m going to take a look at this during the day, I’ll keep you updated

[PeterOz]

disconnect the power lead from the front panel header on the motherboard and to start, short out the PSW SW pins.

If this works I then pug the reset button onto the start pins and use that button to turn the computer on

[Bruce]

@Uncrow - any luck?

[Uncrow]

@Uncrow - any luck?

Hi ! I’m sorry for the late answer ! I still haven’t tested anything even though I said I would but that’s because I had a really important exam so I wasn’t able to. I’ll try today or at worst tomorrow if I need help I’ll ask you guys
So sorry again for the late answer

[Uncrow]

So, while removing the memory I noticed one of them is damaged on the back here is a picture, would this cause any problems ?

[Bruce]

yes!
those solder dots on the side you show line up with transistors of the other side.
that damage would either be breaking a closed circuit or creating a short.

next questions - how did that happen and what flow on effect could have occurred?

[Uncrow]

Ok Nice ! So we’re progressing.
As for the questions I cannot answer any of them sadly
I’ll get some new memory and update you here with the results, it’ll probably be after Monday

[Bruce]

keep us posted when the new memory arrives and is installed.
good luck.

[Uncrow]

keep us posted when the new memory arrives and is installed.
good luck.

Thanks ! I still do not have it though, hopefully it won’t be long

[Rustys]

Do you have an news

[Rustys]

Closed till the original poster hast time to update.

Contact a Mod to have thread unlocked.

[Rustys]

Reopened per user request