Optiplex 390 powers on but nothing else.

My first guess is that if you have the original PSU installed it is not enough power for those upgrades. The original PSU was somewhere around 240W I believe. Also that system was never certified for the i5-3570. And I have not seen a BIOS update that allows for 3rd generation CPUs in the 390.

390 SFF , dead.? NO CASE SIZE TOLD. of the many.  but CPu  answers are below:

WHY read the benchmarks pages on what works.? (I looked for you , none there of 1000's)

the dell spec sheet shows gen2, only (back then long long time ago.

the H61 Express Chipset  ,  by Intel shows  what it can do (and wins all arguments first)

shows it can support gen 3, as seen here.

then you failed to upgrade BIOS first. this is a big error, and dell does not document what bios upgrades do,

only the most, limited terms, (near useless docs) but this was first, and now you got to put the old CPU back and then burn new BIOS, and try again.

now the bench markers. over 6000 deep, in fact now.

i5-3570 ,,   59 pages there. (I see no GEN3)

but if I try to build PC there with 390 it fails with your 390,   so 6000_ I did not get it to work if tried.

they do not report failures, there ,  just pass.

I say no..   but if the mobo  will not take it , all is lost.  (why not get used 3020mt or 9020mt and use that)

Gen4 Haswell up! and win.

a far far better PC, mine cost me $50 , sell yours get $50 dollars in hand and upgrade the whole thing,

NO PC told yet just the near useless 3 digit code 390,  PC.  MT, DT< SFF, USF micro AIO. 

never post lacking such a key fact or photo of  you PC, oK  unless you like wrong answer or 5 answers, 1 right.

1050 TI uses 75w and you have LESS THAN 300W power supply so you have fried your power supply.

GT1030 low profile is the only card that works.

https://www.youtube.com/watch?v=2y32mBdZHJY

https://www.dell.com/en-us/work/shop/msi-gt-1030-2g-lp-oc-graphic-card-2-gb-gddr5-pcie-30-x16-low-profile-hdmi-displayport/apd/aa362018/graphic-video-cards

Hi @speedstep,

Instead of frying power supplies, would the 315w XE2 SFF PSU work in the 390 SFF?  I imagine a 24-pin to 8-pin adapter might be needed?

Would buying an XE2 would be more worthwhile?

yeah looks like it was the cpu, i did update the bios a few months before like i said i didnt see anything about 3rd gen support but figured id try anyways.

it has a 250watt psu, which yes is pushing it a bit. and i said the computer still turns on, if it was fried it wouldn't do anything at all. and after taking the new cpu out its working fine with the 1050ti for the moment, so not sure what your on about.

it is yes, 250watt, and i took the cpu out and put the old one in that was the issue.

and the 1050ti is working great in the computer for the moment

Optiplex 390 Tech Guide 

https://www.ebay.com/i/260758966750?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=260758966750&targetid=596843717518&device=m&mktype=pla&googleloc=1028087&poi=&campaignid=2086088304&mkgroupid=77258593396&rlsatarget=pla-596843717518&abcId=1141016&merchantid=6583194&gclid=EAIaIQobChMIxsjXqfqB5wIVjIbACh3irgEuEAQYAyABEgJlCvD_BwE 

https://www.ebay.com/i/291616153876?rt=nc&_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D1%26asc%3D40741%26meid%3D4ac1c6fc440849c3b229068852f7b7fe%26pid%3D100694%26rk%3D2%26rkt%3D30%26sd%3D260758966750%26itm%3D291616153876%26pmt%3D0%26noa%3D1%26pg%3D2386202 

A couple of links above for possible PSU upgrades.

In the description for the first link, it says "NOT FOR DELL OPTIPLEX 790 990 390 SFF CCCVC."  I don't know what that's suppose to mean.

A possible catch with the 2nd link - it says "slimline" but not "SFF."

PSU upgrades for DT's and SFF's are normally hard to come by.

Good to hear your PSU isn't fried.  If speedstep or another expert answers my questions about the Optiplex XE2 315w PSU, you still might want to consider it.

oh yeah no doubt, just to make sure i did a 6ish hour test with the cpu and gpu around 92-99 % usage and all is fine with stock psu, just a little worried about how long it will last like that

Buyer Attention:
THIS IS NOT FOR DELL OPTIPLEX 790 990 390 SFF CCCVC
Dell Optiplex H240ES-00 H240AS-00 AC240ES-00 AC240AS-00 L240AS-00 240W
with dimension 3x3x9 1/2
*****we are NOT responsible for buyer's purchase mistake !!!

This means the 435W TFX unit does NOT physically fit onto SFF or USFF case.

Its only for DESKTOP.  Thats why the SLIMLINE aka 620S is mentioned.  Its NOT SFF or USFF.

Tower 390 MINI TOWER uses EPS12v  power supply.

There are ZERO units including TFX that fit into SFF and USFF case.

Thats why the GT1030 is the ONLY unit that works.

The Optiplex sell with six different chassis types.

MT (Mini Tower)
DT (Desktop)
MFF (Micro Form Factor)
SFF (Small Form Factor)
USFF (Ultra Small Form Factor)
AIO (All-in-One)

https://www.youtube.com/watch?v=2y32mBdZHJY

If you do not have a TOWER you are already at a disadvantage.  Power Supplies must be adapted.

GT1030 video card would be only card recommended.

Radeon R series cards DO NOT and WILL NOT EVER work in this model so don't go there.  Radeon 7750 card would work but would be slower than a GT1030.Cards must be SHORT and ONE SLOT WIDE ONLY.

https://www.amazon.com/Zotac-ZT-P10300A-10L-NVIDIA-GeForce-PCI-Express/dp/B071NPW8CK/

https://www.youtube.com/watch?v=S8QOR4YoSS0

ONLY SINGLE SLOT ONLY SHORT CARDS

1. 390 means nothing, 
2. the 390 comes in many cases, and many motherboards ,etc, fitted to them , why post lacking
3. A: what it is, case size/ B" or photo of yours, even with side removed so we can see (missing,added or hacked things inside, then answer can be 10x batter OK?

here is generic Dell limit, on mobo, PSU , space etc.  NOT,telling  what case you have is pain.

1. GPU will not fit case (hits things, hits DDR slot levers, hits, HDD cage or more.... no PC told by you.
2. GPU overloads the weak 25watt SFF slot limit or USFF slot or has no x16 slot at all, USFF.
3. GPU overloads weak 235watt PSU
4. PSU on BTX PCs (not yours) has 3mm pitch 24 pin  non ATX standard PSU jack. adapters sold on fleabay.
5. PSU cable all are not ATX at all just 12vdc like my 3020MT, has,  adapters, and I run 750w  62amp single 12v rail in mind and R9 run in mine,  disputed the R series , lies failing.  R9-380 a 190watt  , in my 790 runs all day and sure the PSU must be up graded, has zero to to with R series at all on mine.
6. IN the same vein, the PSU lacks GPU
7. The PSU is ATX like but lacks full set of SATA power cables, get a new PSU buy fist full of adaptors, if possible.  (again no CASE TOLD BY YOU.
8. I have tested vast GPU on my old 790 (its only for a test bed) and only 1 card with  DUAL GPU processor fails, GTX295.
9. here is my list of cards that work and UEFI is off in all cases. MT 790 (very close sister to yours)
10. and last and again, the ~6000 others that upgraded is here, hard cold facts.  why no look here first, ? EVEN RTX ! see it? look.

must we still guess? why? we know only that it is NOT USFF, no GPU  slot there so is NOT YOURs.

got MT"? ?????????????

and last the lame slot limits seen in many SFF manuals. by dell. see it  and look in your manual first

I can not look for you no PC told yet.

got this PSU, ?????  this is  MT PSU. not the lack of SATA power cables and limited distances, (non atx)

265w there. $12   this IT?