Power Supply Problem

[phaedrus06]

Okay here's how it happened.

New computer I got a couple months ago fried due to high incoming voltage. I am fairly certain only the power supply fried though as the components inside appeared to not be smoldering or anything like that. The board on the inside had no remaining charge in them nore were warm in the slightest.

So I got a new power supply. It is 480 watts rather than the original 300 watt supply I had in the computer so power is not an issue, yet the computer does not power on at all. Hell, the fan on the power supply doesn't even turn on. All the cables are connected in the right place:

One small four pin to the motherboard
One 24 pin to the motherboard
Two horizontal four pins to the two DVD drives I have in the computer
and lastly
One SATA type power adapter connected to the hard drive

The computer was Media Center computer I requested HP to build with a Pentium D processor. m7250n is the model. I tried to power on the supply without hooking it up to the computer but that didn't turn on the supply either (not that I thought it would).

So my thought is either the power supply is **** snd I have to return it or the motherboard is gone. I also wondered though if perhaps because my new supply is a different model than the other one that perhaps incompatibility was the problem.

Any help or advice apprerciated

[jfk]

Being a HP computer, the PSU may have proprietary connections. If that is the case, any old PSU off the shelf will NOT work, as the wiring is different than standard. Can you list the FULL specs of the HP computer?

[phaedrus06]

I looked through the computer inside out and these were all the details I could find.


Processor

* Clock speed
* 2.8 GHz

* Processor type
* Pentium D

* Installed processor qty
* 1

* Max supported processor qty
* 1

* Processor main features
* Intel Extended Memory 64 Technology

* Processor manufacturer
* Intel

RAM

* RAM installed
* 1 GB

* Max supported RAM
* 4 GB

* Memory specification compliance
* PC2-3200

* Memory speed
* 400 MHz

* RAM form factor
* DIMM 240-pin

* RAM technology
* DDR II SDRAM

Video Output

* Video Output / Graphics Processor / Vendor
* ATI Radeon X300 SE

* Video output form factor
* Plug-in card

* Video output interface type
* PCI Express x16

Display (Projector)

* Display type
* None.

Service & Support

* Service & Support type
* 1 year warranty

Optical Storage

* CD / DVD read speed
* 40x (CD) / 16x (DVD)

* Optical storage interface type
* IDE

Storage Hard Drive

* Hard drive interface
* Serial ATA

* Hard drive installed qty
* 1

* Hard drive size
* 250 GB

* Hard drive type
* Standard

* Spindle speed
* 7200 rpm

Interface Provided

* Interface
* 2 IEEE 1394 (FireWire) Output, 6 Hi-Speed USB Input, 1 Headphones Line-out, 2 Microphone Generic, 2 Audio Generic, 1 Display / video IEEE 1284 (EPP/ECP), 1 Display / video Ethernet 10Base-T/100Base-TX, 1 Keyboard Phone line, 1 Mouse Line-in, 1 Parallel VGA, 1 Network S-video output, 1 Modem, 1 Audio, 1 Audio, 1 Audio, 1 Audio, 1 Display / video, 1 Display / video

* Connector Type
* 4 pin USB Type A, Mini-phone stereo 3.5 mm, 6 pin mini-DIN (PS/2 style), 25 pin D-Sub (DB-25), RJ-45, RJ-11, 15 pin HD D-Sub (HD-15), 4 pin mini-DIN

Storage Hard Drive (2nd)

* 2nd hard drive type
* None

Optical Storage (2nd)

* 2nd optical storage type
* DVD-ROM

* Read speed
* 16x

Storage Controller (2nd)

* 2nd storage controller form factor
* Integrated

* 2nd storage controller installed qty
* 1

* 2nd storage controller type
* IDE

Modem

* Modem
* 56 Kbps Fax / modem PCI Plug-in card

* Modem protocols & specifications
* K56Flex

Audio Output

* Audio output form factor
* Integrated

* Audio output type
* Sound card

* Sound card name
* Intel HD Audio

Cabinet (Chassis)

* Cabinet form factor
* Tower

Cables (Details)

* Cables
* Phone cable

Cache Memory

* Cache
* 2 MB L2 cache

* Cache per processor size
* 2 MB

Card Reader

* Card reader
* 9 in 1 card reader

* Supported flash memory cards
* Microdrive, Memory Stick, MultiMediaCard, SD Memory Card, SmartMedia Card, XD-Picture Card, Memory Stick Pro, CompactFlash Card type I, CompactFlash Card type II

Mainboard

* Chipset type
* Intel 945P Express

* Data bus speed
* 800 MHz

Miscellaneous

* Included accessories
* Remote control

Networking

* Data link protocol
* Ethernet, Fast Ethernet

* Networking
* Network adapter Integrated

Dimensions & Weight

* Depth
* 16.5 in

* Height
* 15.2 in

* Weight
* 26.9 lbs

* Width
* 7.6 in

Bay Provided

* Expansion bays
* 2 (0 free) Front accessible 5.25" x 1/2H, 1 (0 free) Internal 3.5" x 1/3H, 1 (1 free)

Storage Floppy Drive

* Floppy drive type
* None

Service & Support Details

* Full contract period
* 1 year

* Service & Support details
* Limited warranty

* Service & Support location
* Pick-up and return

* Service included
* Parts and labor

Input Device

* Input device
* Mouse, Keyboard

Power Device

* Power device type
* Power supply

Printer

* Printer type
* None

Video Memory

* Video memory
* 128 MB

* Video memory technology
* DDR SDRAM

OS Provided

* OS provided
* Microsoft Windows XP Media Center Edition 2005

Storage Removable

* Removable storage type
* None

Slot Provided

* Slot provided
* 1 (0 free) Processor LGA775 Socket, 4 (2 free) Memory DIMM 240-pin, 1 (0 free) PCI Express x16 Type I/II, 3 (1 free) PCI, 1 (1 free) CompactFlash Card, 1 (1 free) SmartMedia Card, 1 (1 free) Memory Stick, 1 (1 free) SD Memory Card, 1 (1 free) XD-Picture Card

Storage Controller

* Storage controller form factor
* Integrated

* Storage controller installed qty
* 1

* Storage controller type
* Serial ATA

Thanks again.

[phaedrus06]

Sorry if that seems too long. Just trying to be as complete as possible.

[phaedrus06]

By the way, can a power supply turn on without being attached to a computer? No? thanks.

[Gizmo]

No, the PSU needs to be attached to something to conduct it's output. It needs a certain load to give power to. An alternative PSU isn't going to work in a particular motherboard with power contacts of differing orientation to a standard PSU wiring. Contact HP to inquire about a PSU replacement, make sure you have the model number of the computer and the PSU at hand.

Or better yet, have HP give you another computer. That's what warranties are for.

[chuck4456]

You could have easily voided the warranty by digging around in there. Put everything back the way it was, and contact HP.

[phaedrus06]

Trust me, I thought about the warrenty but it was refurbished so I don't believe there is a warrenty. I checked and couldn't find anything. Well I'll try the power supply idea supplied by Gizmo. Thanks everyone and if you all have any other suggestions I'll be checking in.