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Psu wont turn on

My computer turns on, within a second it turns off no beeps.

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Test the PSU. Unplug it from the motherboard and then with nothing connected, short the green wire to any ground (usually a black) using a paperclip and it should come on and stay on if the problem was with the motherboard/computer but if it shuts down, then you know the problem is the PSU itself.

If the PSU stays on under no load, then one possibility is you had too much connected to it and it shut down as a protective feature. The Bios would not beep if the PSU is shutting itself down. Also make sure you have the internal speaker connected. It's possible you just can't hear the beep because there is no speaker connected or it may be connected to the wrong place.

Don't throw away a defective power supply. It is worth a couple bucks as parts for an electronics enthusiast. Keep it out of the landfill.

Posted on May 08, 2015

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bronk50
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SOURCE: desktop power turn on but

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO YOUR HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error even something as small as a faulty electrical extension or fan lead can cause this problem

computers need all of the data and electrical current to travel through every working device and to have an end to be able work properly

a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail check all electrical power input and extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working

also check the Cmos battery and computer ram make sure they are securely seated with no dust built up or in the sockets

hope this helps you

Posted on Aug 10, 2011

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1 Answer

1 LONG BEEP, 2 SHORT BEEP


1 long, 2 short Failure in video system: a checksum error was encountered in video BIOS ROM, or a horizontal retrace failure has been encountered

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1 long beep, 2 short beep


You have a bad RAM, install just 1 module and try, is doesn't swap the memory module and try again.

http://www.gigabyte.com/support-downloads/faq-page.aspx?fid=816

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Ps3 wont stay on it just flicks off inside a sec


Is this a slim ps3??? If it comes on and goes back off within 5 seconds or so with no beeping chances are its the psu (power standby unit). Lots of slims have had this issue. Replacments on ebay are 40-60$$$.

Mar 05, 2012 | Sony Playstation 3 (PS3) Console

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Getting 4 beeps with memory out, drives disconnected, empty PCI slots. Swapped power supplies and got the same error condition. System was working and quit unexpectedly. Even unplugged the fans and got the...


you posted a mobo number not a PC real name.
its HP 412410-003 HP 442031-001 S775 A/V M/B
that is XW4400 ( I own a mint xw4600 ) simular.
why post MOBO #'s and not true PC name?????????

no MOBO works ever with all memory out , why do that?
just to hear the 4 beeps the manual on the PC
its a HPE workstation in fact not a PC.
the PSU is dead. (or a gross short)
why not test the PSU First with the jumper clip
im reading your manual for you now XW4400
it says. BAD PSU.

Blinks red 4 times (once per
second), then a 2-second
pause, and then 4 beeps


the fans slow means 12vdc is weak as in not at 12vdc.
only 2 things cause that.
bad PSU, or the 12vdc bus is shortred.

more sure
5 beeps is memory dead, low bank.
6 is video bad. GPU card.

the beep code 4 is top priory error
think about that, if power is bad, all else IS
in electronics power is first. and always first.
means at spec.


the test is easy and 3 fold is savvy
1: the jumper test.
http://www.pcdied.com/power.html#rapid_testing
2: same as above, but turns on and voltage test all pins.
3: if really pro- a load bank test, puts full load on PSU.

that is why shops with tools waste little time.

strip all things off the MOBO
memory
all drives
all PCI cards and express cards. (all but CPU) CPU dont fail
if the heatsink has not fallen off.
remove all things that can short out 12vdc, fans and drives.
do not run it with fans pulled for more than say 15 seconds
use a voltmeter, turn it on
measure 5v and 12v and 3.3v psu pins. seen in link above
a dmm meter is $20 at warfart. anyone can use one, easy.
the black wires are ground (common) meter black to black.
red meter to the 3 top power pins on PSU jack.


now my wild guess, bad PSU. but I cant strip your PC nor watch you.

732d9676-7fbe-42a9-9725-ef871ff6a0b2.jpg

Jan 12, 2018 | HEWLETT-PACKARD HP 412410-003 HP...

2 Answers

Pc wont boot, MCP73PVT board, i have checked the ram, processor, heat sink and psu,cmos batt and still no joy, its starts for 4 seconds and turns off, all fans come on but nothing else no beeps


Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO THE HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

May 21, 2011 | Packard Bell (181368) Motherboard

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The PSU fan does not run, computer shutsdown.


Check the CPU fan, it may be faulty and causes the CPU to overheat and shut down.

Sep 02, 2009 | E-Machines eMachines Desktop PC

1 Answer

Screen goes blank within 1 second of being turned on


Bad capcitor in the psu would cause this to squel and even pop so have it looked at you be glad you did.

May 23, 2009 | ViewSonic VA720 17" LCD Flat Panel Monitor

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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