If you still have all this stuff in the original Gateway box, you cannot use a standard ATX power supply because it will not fit.  You will have to either buy a new box or do some drilling and cutting on the back panel of the Gateway box.  I tried to buy a Gateway power supply with 250 or 300 watts a year ago, and was told that they did not have such things.  They sold me a new 200 watt PS.  If I had it to do over, I'd buy a new box and a regular non-proprietary PS.

>
>Hello to all
>I recently bought a CPU upgrade device from PowerLeap (PL-iP3/T)
>(www.powerleap.com) to upgrade my Slot 1 Gateway Pentium II 400 up to a
>Celeron™ (Tualatin) processor with 256K L2 cache running at 1.2 GHz on a 100
>MHz bus. I have upgraded the motherboard's (Tabor MP440BX) BIOS to Gateway's
>latest version (4M4PB0X1.15A.0033.P21) but cannot get the device to POST.
>
> When I install the adapter and start the machine it powers up, the LED on
>the adapter device lights up indicating it is receiving power, the HD light
>lights up for several seconds indicating activity, but the machine never
>POSTs. PowerLeap suggested that I may not be pressing the adapter fully into
>the MB but I have made sure that it is fully seated. The adapter has an auto
>sensing unit which sets the FSB speed and voltage for the type of CPU chip.
>This can be overridden with manual settings which I have also tried with no
>success.
>
>A search of the newsgroups tells me that several others with my MB and CPU
>have successfully upgraded with the adapter so I know it is possible. It is
>very frustrating not being able to get my system to work with this device
>but I'm not sure what the problem could be. After further research, I have
>seen some references to a lack of adequate power from the power supply. Is
>this possibly the culprit? This machine (Gateway E4200) was purchased in
>August 1999 with Windows 98SE and with a Pentium II 400, 96MB RAM, DVD, ZIP,
>and CD drives, as well as the standard floppy and 13.6GB HD. It came with a
>network card and a 56K modem. The video was an 8MB ATI AGP Rage 8MB card and
>the sound from a Creative SoundBlaster Audio PCI 128D. The power supply is
>200 watts.
>
>I changed to Windows Me and have disconnected the ZIP drive but now have the
>original 13.6GB 5600RPM HD and a 60GB 7200RPM HD. I swapped the CD drive for
>a CD-RW and still have the DVD drive. I pulled the original video card and
>installed a Hercules 3D Prophet 4500 w/64MB of memory. I raised the RAM up
>to 384MB. The original soundcard, modem, and network cards remain in place.
>I realize that the present load on the power supply is greater than the
>original but the machine runs well with no problems. Is the addition of the
>adapter and its Celeron 1.2 GHz chip the proverbial "straw that broke the
>camel's back"?
>
>Any advice would be appreciated as I am not presently in a position to buy a
>new machine and look on this adapter as a way to triple my CPU speed for
>$169. If I need a more powerful power supply can I just swap my Gateway unit
>out for another one that will fit in the same place without modification?
>
>Thanks for any advice.
>

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