Computer gets power but does not turn on

Hewlett-packard Pavilion m7560n media ce...
August 21, 2010 at 17:53:18
Specs: Windows XP 2006 Media Center Edition (64-Bit)
The computer I am working on (which has worked before in the past) receives power from what I know. The Ethernet port lights up when I plug in the power cable, but no fans spin when I hit the power just doesn't turn on. I currently believe it's the power supply, but the computer is not old at all! Can anyone help me out here?? This is a very nice computer that I would like to use...

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August 21, 2010 at 18:20:29
Well the PSU is the first but not the only suspect and troubleshooting begins there.
The fact the motherboard gets some power when connected is no sure indication of a healthy PSU. Since the PSU provides power in several voltages on different circuits partial failures are common. Start with a known good compatible PSU and then post back and let us know whether or not that solves the problem. It might be useful to know some history of the system. ie what exactly happened at the time of failure.

Goin' Fishin' (Some day)

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August 21, 2010 at 18:46:29
This computer probably has a BESTEC 300 watt power supply.
BESTEC power supplies have a POOR reputation - they tend to fail more often than average, and when the power supply fails completely, they are a lot more likely than average to damage something else, often the mboard.

Unplug the cord to the computer, or otherwise switch off the AC power to it, open up the computer case, and find the label on the power supply - if the brand is BESTEC I advise you, when you find ANY indication the power supply might be in the process of failing, DO NOT trying booting the computer anymore - if the PS fails completely there is a strong likelyhood it will trash your mboard !!!!

If you can borrow a used PS from another computer you have or a friend has, that has 300 watts capacity or more, try that with your computer before you buy a new one. The BESTEC PS may have already trashed the mboard !

Did you by any chance install a PCI-E X 16 video card in this computer?

If so,

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.

If it is failing, or if you need a PS with more capacity, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:

DO NOT buy a BESTEC power supply !


HP Pavilion Media Center TV m7560n Desktop PC
(main support)

HP Pavilion Media Center TV m7560n Desktop PC Product Specifications

Expansion slots
Slot type Quantity
PCI Three (One available)
PCI Express x16 One (One available)

* Therefore - you had a PCI-E X16 slot available.

Operating System

* Microsoft Windows XP Media Center Edition 2005 with Update Rollup 2


When you search for parts with: m7560n here:

There are only 4 possible product numbers listed - all have a 300 watt (output capacity) power supply.

If your product number is EX505AA or EX505AAR

Power Supply
(HP part number) 5188-2625 Power supply - 300-watt (Merlot C) regulated

Search with: power supply 5188-2625 on the web finds:

Bestec ATX-300-12Z CDR

"Windows XP Media Center Edition 2006 64 bit"

There's no such thing as a 64 bit version of XP MCE.

- Windows XP Media Center Edition 2005 ("Symphony", Nov 2004) is the first edition of MCE available to non-Tier 1 system builders. Among other things it includes support for Media Center Extenders, and CD/DVD-Video burning support.

- Windows XP Media Center Edition 2006 ("Emerald", Aug 2005) is a service pack- like update of MCE 2005 (Symphony) and was a recommended download designed to be installed on top of existing Symphony.

The 2005 release was the final one, but it was updated a number of times to incorporate new capabilities such as support for the Xbox 360 as a media center extender, DVB-T broadcasts, and support for two ATSC tuner cards.

64-bit editions

Two distinct editions of Windows XP were released to support 64-bit hardware.
- Windows XP 64-Bit Edition

Two versions of Windows XP 64-Bit Edition were released:

- Windows XP 64-Bit Edition for Itanium systems, Version 2002 – Based on Windows XP codebase, was released simultaneously alongside the 32-Bit version of Windows XP on October 25, 2001.[23]
- Windows XP 64-Bit Edition, Version 2003 – Based on Windows Server 2003 codebase, which added support for the Itanium 2 processor, was released on March 28, 2003.[24]

This edition was discontinued in early 2005, after Hewlett Packard, the last distributor of Itanium-based workstations, stopped selling Itanium systems marketed as 'workstations'.[

- Windows XP Professional x64 Edition

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August 22, 2010 at 18:03:52
Hey guys, thanks for your contributions, I have fixed the problem now, turns out the red switch on the power supply was switched in the wrong direction. By the way tubesandwires, I'll take a look and see if it's a BESTEC.

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Related Solutions

August 23, 2010 at 07:01:11
How did the red voltage switch get set the wrong way ?

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August 24, 2010 at 19:07:27
I personally have NO idea. But it was, so I switched it back. xD

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