Optiplex 7050 Not Turning On

Question

Got an Optiplex 7050 SFF used. When I plugged in the computer for the first time, I heard what sounded like all internal fans spinning at max speed for a moment and then shut off. I also smelled that classic burnt electronics smell (and immediately unplugged it from the wall). I have been unable to get any sign of life from it since. When plugging in the power cord, the green power supply light on the back illuminates and stays on (I can tell that the power supply fan is running). Pressing the power button does nothing (no fan activity, no diagnostic or power button LEDs at all). I have tried unplugging everything (including internal components) with no change. Unplugged the power supply from wall, held power button for 30 seconds, plugged it back in and no change. Any ideas?

MattP610 · Accepted Answer

I believe my issue was bent CPU pins. After trying to power it up with a different PSU and getting the same result, I just started tearing down the PC to try to find an answer. Noticed some questionable CPU pins and although I could have probably tried to repair, I found a cheap replacement of the mobo on Ebay. Switched motherboard out with the replacement and everything works great. Thanks for the help, Brad!

bradthetechnut · Answer

By any chance is the 7050 returnable?

A couple of things about the PSU - 1. A bad PSU can still spin the fans. 2. Green light means that PSU has power and the peripherals are good. It doesn't necessarily mean the PSU is good.

I think the PSU is bad even though I don't hardly hear of it on something as new as a 7050.

Burnt plastics smell of course is a bad sign. Can typically mean a blown capacitor. I'd try returning the 7050 and/or getting a refund rather than try to stick anything into it.

Sometimes, as a first resort if a PC isn't booting, or even making it to POST, we'll suggest try changing the size 2032 CMOS battery. However, in this case, I believe the PC is a brick. It would still show signs of life even with a bad battery.

bradthetechnut · Answer

By 'blown capacitor,' that could be either PSU or MB.  However, with getting a green light from the PSU which is an indicator of good peripherals, MB just might be good. In case this thread goes further, with mentioning 'Corsair slim form factor,' I take it the 7050 is an SFF.

DELL-Cares · Answer

Hello, I see you are looking for technical assistance. If you need our help, you can start a private message with us and we will be happy to assist you.

MattP610 · Answer

Thanks for the reply! I actually got the PC for free and it has pretty decent specs so I have some interest in ruling out the PSU. That's what I'm hoping it is. My intent was to replace the PSU for a Corsair slim form factor anyways to help power a GPU replacement. I'm thinking about ordering a cable to convert a standard 24 pin PSU down to the 6 pin and use an extra PSU that I have on the shelf just to see if the rest is still good. When you say 'blown capacitor', do you mean on the MB or the PSU?

MattP610 · Answer

Yes, it is the SFF 7050. Partly why I'm so interested in it. Very powerful PC with a small footprint.

bradthetechnut · Answer

You're right, a standard ATX PSU doesn't fit in the 7050 tower. And... Not pretty, but a standard PSU would have to sit outside the case.

MattP610 · Answer

Actually, this may be the standard tower now that I'm looking at the manuals. Seems small though. I doubt a standard power supply would fit in this.

MattP610 · Answer

https://youtu.be/lAejOvxFHkc?t=900

BogdanXP · Answer

@DELL-Cares​ First of all, sorry if a my write in broken english, not my native language. Problem: I've bought an refurbished Dell Otiplex 7050MT. Having an dedicated graphic card,  I've replaced the standard PSU with an TFX one. The new PSU has 24 pins for MB, so I got an 24pins to 6 pins adaptor. The Pc started, normaly. When I insert the power cord cable the new PSU, the vent of the PSU starts going. And it does not stops when I torn of the pc. Heeelp!

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