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Dead p2721 psu - Computers & Internet

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We did a quick fix and replaced the psu for quick turnround.

Posted on Nov 11, 2008

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6ya6ya
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Posted on Jan 02, 2017

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No debug LED show on my flaming blade gti


If your PSU give wrong voltage it produce same problem with 2 solution:
1-test your PSU
put a wire between green and black and voltage must be:
yellow 12V, red/purple/gray 5V, orange 3.3V.
If your PSU give under voltage (more than -10%):Buy a new one and test your motherboard(mb) with it (in this case there aren't a lot of chance that your mb and/or your CPU are dead)
If your PSU give good voltage:(-10% / +5%):There are a lot of chance that is you mb or CPU
If your PSU give over voltage:Buy a new one and test your motherboard with it (in this case there are a lot of chance that your mb or/and your CPU are dead)

Nov 19, 2012 | Foxconn Computers & Internet

1 Answer

HP P4SD, its running good with 4 gb RAM, P4 3.0ghz, and a couple sata hd. The problem is the fan output voltage, i havent been able to read the output chassis and cpu cooler pins voltage cause i can find...


"i can find my dmm?" did you mean CAN'T?
"its clearly off", what is off?
the fans are 3 pins,2 are power, one is RPM tachometer.
"it all works fine", so you can boot and run any OS, ?

"the voltage reads +12vdc", where, at fan or PSU?
the fans run off 12vdc, they are DC motors (from outside fan)
if the fan runs slow at 12vdc the the fan is bad or is a low RPM
fan, as some are, bigger fans run slow, for less noise.!

first is the CPU fan it must run full speed, if not the CPU will overheat in seconds and ALL CPU shut them selves (by there selves) this way. so CPU fan is first. what does it do... there....?

then BIOS screens. GOT BIOS UP? and running? with, ESC key pressed>.
let me guess your symptoms
1: PC dead. will not boot.
2: BIOS dead.
3: all fans DEAD,.
4: power switch works and all PSU voltages read right, (seems not)/?
5: if the PSU power wire reads right(DMM), matching the side sticker voltages, and the CPU is dead, the MOBO is dead, or CPU is toasted.


here is a modern PSU, sticker.
see 5 to 10 power lines, see them. all must read correctly
if a fan is dead, then its dead if 12vdc is present on the fan power pins.




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Apr 28, 2017 | HP Asus Motherboard P4SD-LA Socket 478...

2 Answers

Server is not powering on


Switch PSU between bays Use spare PSU
If server is still not working PSU backplane needs to be replaced. IS spare PSU sovles the issue, then it was a faulty PSU

Feb 26, 2011 | HP Compaq ProLiant ML350 G5 Server

1 Answer

Dead psu


Apply a new PSU, the question is is it worth it to you? A psu is rather expensive to replace I would not try repairing it if I were you.

Apr 22, 2009 | Televison & Video

2 Answers

How can I test FSP250-60 ATV power supply to see if it works or not? Can I test it before I buy a replacement unit? Computer will not power up. Alredy switched power cords several times...and it still...


A great way to test a PSU is to use a PSU Tester. The device allows you to see if all the circuits are getting power and it only requires you to plug it in to power. This allows the ability to test it safe and reliably without accidentally damaging hardware. Below is a link to a tester.

PSU Tester

Feb 03, 2009 | AOpen Computers & Internet

1 Answer

Dead 6513 / PSU failure


Goto copytechnet.com.  That site is like fixya but it's copier technicians only solving problems.  They should be able to help you with the PSU diagrams.

Oct 10, 2008 | Ricoh 6513 Copier

2 Answers

Asrock P4i65G Motherboard


If the CPU is dead the problems can be
  1. no power
  2. no fans etc or
  3. power, no beeps (errors)
If the Ram is not compatible it would be constant beeping.

With the board in, and power supply 20pin + 4pin Pent 4 power attached,(#2 and #7 of motherboard layout) remove power cord from power supply.
CLRCMOS0 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and system
setup parameters. To clear and reset the system parameters to default setup,
please turn off the computer and unplug the power cord from the power
supply. After waiting for 15 seconds, use a jumper cap to short 2 pins on
CLRCMOS0 for 5 seconds. Remove the jumper. Remove heatsink and fan from CPU. disconnect cpu and reseat it. Re-install heatsink and fan. Plug in the power cord. Try to boot up. If it still does not boot and (no power, no fans etc.) problem would then be cpu is fried.



Jun 02, 2008 | Computers & Internet

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May 24, 2017 | Norton Computers & Internet

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