Forum Thread

Replaced PSU, Dell PC wont power on now.

Wek 491 38 January 23, 2016 at 08:39 PM
I am stomped on this problem. I am trying to replace the OEM PSU from a Dell Vostro 260 with a brand new EVGA 600 watts PSU to be able to use a dedicated video card. The new PSU works perfectly fine and I have tested it in my other PC. However, once installed it on the Dell (all cables have properly been connected) the PC doesn't power on. The motherboard light turns on but CPU fan does not spin. The other components (including the video card I want to use) aren't causing any problem since I am currently using the PC with the OEM PSU with no problem. I have tried clearing the CMOS but that didn't work. Any ideas what might be the problem?

Thanks

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#2
Does the new PSU have extra power connectors which should/shouldn't be connected to your dell? Like this [smps.us]
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#3
Quote from hanji1 View Post :
Does the new PSU have extra power connectors which should/shouldn't be connected to your dell? Like this [smps.us]
The new PSU is this one [newegg.com]. I connected the 20+4-Pin ATX cable as a 24-pin cable (both connectors). Would there be a reason why I shouldn't have connected both connectors? Last time I messed with a PC guts was a long time ago and there was only 1 connector for this type of cable.
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#4
Quote from Wek View Post :
The new PSU is this one [newegg.com]. I connected the 20+4-Pin ATX cable as a 24-pin cable (both connectors). Would there be a reason why I shouldn't have connected both connectors? Last time I messed with a PC guts was a long time ago and there was only 1 connector for this type of cable.
Look at the old psu, see if you can remember what was connected to something and what wasn't.
Match all the things that were connected to the new psu. Also look for anything on the mobo that isn't needs a connector.
Make sure you check the power switch on the back of the psu, the cable, surge protector, and wall outlet.

EDIT: read OP more closely... check the power header from the front panel maybe you bumped / dislodged something without realizing it. It's still a good idea to make sure you didn't miss a connector.
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Last edited by jkee January 23, 2016 at 11:11 PM
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#5
Quote from jkee View Post :
Look at the old psu, see if you can remember what was connected to something and what wasn't.
Match all the things that were connected to the new psu. Also look for anything on the mobo that isn't needs a connector.
Make sure you check the power switch on the back of the psu, the cable, surge protector, and wall outlet.

EDIT: read OP more closely... check the power header from the front panel maybe you bumped / dislodged something without realizing it. It's still a good idea to make sure you didn't miss a connector.
I checked all connections a few times. I am only connecting the minimum (CPU, video card, and motherboard). The front panel is fine since I can power on/boot up when using the OEM PSU.
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#6
is there a power connector (4 or 8 pin) near the CPU? does the video card have it's own power cable (6/8 pin?) anywhere?
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#7
lots of issues it seems
\
http://en.community.dell.com/supp...?pi21953=2

did you check the motherboard for bad caps?
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#8
Fixed the problem, whatever it was. I tried to connect the new PSU again and this time I made sure to pressed up on all connectors firmly. Thanks for all the help.
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#9
Quote from Wek View Post :
I checked all connections a few times. I am only connecting the minimum (CPU, video card, and motherboard). The front panel is fine since I can power on/boot up when using the OEM PSU.
Does it post with the new video card and old PSU no hdd connected.
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