Inspiron 620, no replacement PSU will turn it on

I have a Dell Inspiron 620 desktop that's got me flummoxed. First, it was not powering on. After testing a few things I got a non-standard reading from a PSU tester (slow on the PG reading) and decided to try changing that.

I put in a 400 W Diablotek PSU that tested fine and works fine in other computers, but the Dell wouldn't start. I subsequently tried several other PSUs, all of which test fine, all of which power their machines fine, all at or above the 300 W rating of the original Dell adapter. None of them work.

Meanwhile, I cleaned out the one that I thought had failed (it had a lot of dust) and reconnected it (24-pin MOBO, 4-pin MOBO, sata DVD and sata HD) and lo and behold it starts. But when I try any of the other PSUs, they still do not start (no partial start, no fan, nothing).

The original PSU looks standard to my eye, the only difference I see is that the 4-pin power connector is 2 brown and 2 black instead of most of the others which are 2 yellow and 2 black. Is that a meaningful distinction that's preventing any replacement PSU from starting the machine? Any insights would be greatly appreciated. Thanks!
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More about inspiron 620 replacement psu turn
  1. Tier 5 - Other than the units listed above for any of these brands, NOT RECOMMENDED. Replace ASAP if you have one.

    A-TOP Technology
    Apevia
    APEX (SUPERCASE/ALLIED)
    Aspire(Turbo Case)
    ATADC
    Athena Power
    ATRIX
    Broadway Com Corp
    Coolmax
    Deer
    Diablotek<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
    Dynapower USA
    Dynex
    EagleTech
    FOXCONN
    FSP Everest
    HEC Orion
    Hiper Type-R
    Huntkey
    I-Star Computer Co. Ltd
    In Win
    JPAC COMPUTER
    Just PC
    Kingwin Inc.
    Linkworld Electronics
    Logisys Computer
    MGE
    MSI
    NMEDIAPC
    Norwood Micro/ CompUSA
    NorthQ
    NZXT
    Okia
    Powmax
    Q-Tec
    Raidmax
    Rocketfish
    Rosewill
    SFC
    Shuttle
    Skyhawk
    Spire Coolers
    Star Micro
    STARTECH
    Thermaltake Purepower NP
    Thermaltake Purepower RU
    Thermaltake TR2 (and TR2-RX)
    TOPOWER TOP
    Ultra X-Connect
    Ultra X2 >greater than 700 watt
    Ultra LSP
    Wintech
    XION
    YoungYear
    Zebronics
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