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Storfot51
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Power supply

HP xw6400 workstation, PW394ET#AK6

My does not start, and  the power led is flashing, and a bip coming in sequence 4bips, a pause, and 4 bips and so on.  testThat Iindicates power supply problems. I tested the power supply according to the procedure, and it is gone. 

Can I use  Corsair VS650 650W PSU in my HP xw6400 ?

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Power supply

I have used some atx supplies on a xw6400 however many models are not suitable due to their design you need one that has a single rail design with a true 650 watts of power and has a 8 pin aux CPU power connector

(i do not recommend using  a 4 to 8 adapter)

 

if you look at the xw6400 service manual power supply pinouts on page 157 you will see it is not fully atx compatible

dure to it using pin 20 as a ground pin and on atx this pin is unused however this ground pin actually makes no difference in the real world, so for our purposes you can consider the xw6400 power supply to be atx compatible

 

https://jp.ext.hp.com/lib/doc/manual/workstation/xw6400/364898-001.pdf

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Power supply

Back when we were using the xw6400 workstations I found that it was rare for their power supply to ever go out, and I got replacements from eBay, used, and not one of those ever went bad later.  I found that was the best way to go... and just checked for you.  There is one available for a reasonable cost plus shipping..... I'd grab that now.

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