If you push the test button on the PSU, does it light the green light?  If not, unplug all internal and external peripherals, except the MB.  Plug back in one by one until you don't get the green light.

Reseating RAM one by one, or test one stick a time, can also be a common solution.

hi mate yup has the green button and ive already taken all the ram out and reaseated it

as above i did, got any idea what to do next? this error code isnt listed in the manual at all

Hi @Gary1986 ,

I did receive your PM, and luckily get email notification.  Private messaging hasn't been working in Android 8 and 9.  I do this from my phone as that's my only internet.

Did you try the 1st idea?

This site isn't working very well today.  Can't sign in while using Chrome, so I keep having to move URL's to Firefox.  (Links from my email automatically open in Chrome.)

The only other idea I can think of is if you want to keep the T3500 going, replace the MB.  Make sure it comes with something for a return policy, typically 30 days.  Probably fairly cheap on ebay.

https://www.ebay.com/sch/i.html?_nkw=precision+t3500+motherboard&_sop=15 

hi, do you have any way to test if the mobo is bad at all? The light on the front is solid green which means the mobo is good apparently 

I don't really care if I get it up and running as i recieved the two for free 5 days ago

I am going to give it to a friend if I (or someone else) helps me figure out this error code

hmm i was thinking are there any diagnostics you can run on the mobo from dell and dont require any tools. (the friend i am going to give it too doesnt have a pc and wants one to start gaming on).

Short of the MB, it would take a computer shop or your friend if they have diagnostic equipment (or if your friend is more of a guru) to analyze it.

No.  The lit numbers and power button light when it turns orange are the diagnostics from Dell.