Installed A New PSU On Dell Optiplex 780 And Getting No Display

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Lasagnaboy

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The other day I installed a Diablotek DA Series 350w PSU. The computer I installed it into was a Dell Optiplex 780 mini-tower. The installation went fine. However when we plugged it in to the monitor there was no display even though the fans were running. Can someone please tell me what the cause of this might be?
 
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Titan
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May 18, 2007
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Diablotek is one of the most horrible PSU brands out there with a reputation for destroying hardware. The original PSU was most likely better than that despite its lower nominal rating so you might want to put it back in unless the reason you got the Diablotek was because the original PSU died. In that case, there is also a possibility the original PSU took the motherboard or other components with it when it failed.
 
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Lasagnaboy

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Oh. Okay I'll tell him that. Thanks for the advice. What is a good PSU brand that isn't too expensive?
The original PSU didn't die. He replaced it because he's getting a GTX 750 TI in the mail. Is 250w enough?
 
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Titan
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250W might be enough, depending on how much of it is on the 12V output.

As for which PSU to get, use the list for inspiration:
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

The EVGA 500B is a frequent recommendation. The Antec VP450 is also a decent pick if you want to shave pennies without compromising too much on quality. If you do not mind opening the wallet a little wider, there is the Seasonic S12-II series. Anything from tiers one and two should easily be more than good enough, tier three is somewhat of a mixed bag, tier four might be worth considering for temporary setups or "don't care" PCs and tier five units should be avoided as much as possible.
 
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cdabc123

cdabc123

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i run a heavily overclocked 750ti with a 130watt TDP xeon, 6 dimms, 3 hard drives. on a 240 watt psu. with them quality is everything.
 
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Titan
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If you are handy with a multimeter, check the 5VSB, 3.3V, 5V and 12V output voltages to see if they are within specifications. Also check the PWR_GOOD# (grey) wire from the ATX PSU to see if it is under 1V as it should be. If the output voltages and PG look good but the PC seems to be doing nothing more than spinning some fans, then you are very likely looking at a busted motherboard and possibly other parts.

If there is no PC speaker connected to the motherboard's speaker header, you may want to plug one in just to see if you get POST beeps which may tell you what the problem is. If you get beeps but no display, then the motherboard might be fine but the GPU could be busted. If you get no beeps at all, then it means the CPU is not doing anything during boot and this could be motherboard or CPU issue, or both.

There is a very good reason why Diablotek is in tier five. Worst case, it may have fried all of your components, which is exactly what Diablotek is (in)famous for. Many contributors to the tier list recommended somewhat jokingly (since tier five is already "replace immediately") the addition of a sixth tier specifically for Diablotek and the few other brands that are exceptionally horrible.
 
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Lasagnaboy

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All the voltages are good. I haven't tried speakers yet. The GPU is integrated so I don't think it is that. The motherboard is kind of old and my friend treats the computer kinda roughly. It was working well before though.
 
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