Dell Optiplex 9020 (MT) Power Issue???

Question

I need help, my Dell Optiplex 9020 (MT) wouldn't turn on, There's no light on the power button, white, amber or blue,... I tried performing the Power Supply self-test using the BIST button on the back, The Power Button LED does not turn on, both ODD drives LED on my PC turns on, CPU/GPU fan on, case fan on. I tried unplugging my external components and internal, still the same issue, could it be the power cord to the PSU causing the problem ?!? Please help ;-; .

speedstep · Accepted Answer

9020 is proprietary 8 pin power supply.

Requires 24 to 8 pin adapter.

There is even a guy who designed his own adapter

https://raphtec.wordpress.com/projects/dell-poweredge-t20-atx-power-supply-adapter/

https://www.moddiy.com/products/Dell-OptiPlex-9020-PSU-Main-Power-24-Pin-to-8-Pin-Adapter-Cable-30cm.html

Recommended Replacement is EVGA 700BR

https://www.evga.com/products/product.aspx?pn=100-BR-0700-K1

https://www.bestbuy.com/site/evga-br-series-700w-atx12v-eps12v-80-plus-power-supply-dc-dc-technology-black/6346160.p?skuId=6346160

redxps630 · Answer

a failing psu can do that. a bad psu can still turn on fan sometimes. if you have a working psu you can borrow it to test the board. for CMOs issue you can reset CMOs jumper on motherboard too.

redxps630 · Answer

For testing you remove all video cards just test with integrated gpu. You only need a small psu to test motherboard. I have a handy SFF from old Dell dimension that has 24+4pin, I think <100 W, I used to test multiple pc. To turn on mobo you need very little power. But a bad psu cannot supply the correct voltage etc thus can fail to turn on board, although fans can still turn on.

not saying you definitely have bad psu, but sth to quickly rule out other than CMOs issue.

speedstep · Answer

Cmos battery may need to be replaced then check again.

https://www.dell.com/support/article/en-us/sln130418

Unplug everything

Remove battery

Hold power button on discharge any remaining power

put new battery in.

plug in only power cable and see if it turns on.

chcknslyr · Answer

yeah, maybe i'll replace the power supply too, im cutting it pretty close with my gtx 750 ti, i have the 290w one

chcknslyr · Answer

Ok thx, wil try that once i get a new CMOS battery

chcknslyr · Answer

Ok, so i tried reseating my stuff in the pc and somehow fixed the problem. Idk if theres any video ouput cuz i dont have a monitor but it turns on when i press the power button and all, BUT theres an orange LED on my power button before the white LED turns on, there are no flashing or anything, just orange then white, fans in the system runs well, drives LED on,... So I was confused and shut it down. And then like 30s seconds after everytime i turn my pc off, it just boots up and shut down by itself, orange light first then white for like 3 seconds or less and then just shuts off. It happens everytime i turn the pc on and off. Anyone got any idea whats going?!?! should I replace my PSU? CMOS battery? MOBO???

redxps630 · Answer

you need a monitor to test POST video. without that it is hard to tell you what is going on.

chcknslyr · Answer

k, ima get a monitor pretty soon. I have to fix this PC because it's all i have. I really appreciate what you're doing.

bradthetechnut · Answer

Indeed, replace the size 2032 CMOS battery.  It's often a cheap and easy place to start in older/somewhat older machines.  A bad battery will cause seemingly unrelated bizarre problems, including boot issues.  Duracell or Energizer is suggested as Sony only last me 2 years.  They should last 5.  Better deals on Amazon than in store.

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