Earlier this week the power supply died requiring me to change the 400 W to 550 W and even thought the motherboard is getting power (the lights come on and couple of times the computer started only later it shutdown automatically without any symptoms (burn smell or any faulty connection). I have tried several times to connect few peripherals to the motherboard and startup but the power comes on and within 2-4 seconds the system shuts down unexpectedly. Kindly help me to resolve this issue -
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This guide was developed to instruct readers on the proper procedures
for installing a power supply unit (PSU) into a desktop computer case.
It includes step-by-step instructions with photographs for the physical
installation of the PSU into a computer case.
IMPORTANT: Many name brand manufacturer PCs use specially
designed power supplies that have been built specifically for their
systems. As a result, it is generally not possible to buy a replacement
power supply and install it into these systems. If your power supply
is having problems, you will likely need to contact the manufacturer for
CAUTION: All power supplies contain various capacitors
inside of them that retain power even after the power supply had all
power turned off. Never open up or insert any metal objects into the
vents of the power supply as you can risk electrical shock.
To start with installing a power supply, it is necessary to open
up the case. The method for opening the case will vary depending upon
its design. Most new cases use either a panel or door while older
systems require the whole cover be removed. Be sure to remove any screws
fastening the cover to the case and set them aside.
Align the new PSU into place in the case so that the 4 mounting holes
align properly. Make sure that any air intake fan on the power supply
that resides in the case is facing towards the center of the case and
not towards the case cover. Now comes one of the most difficult portions of the power supply
installation. The power supply needs to be held in place while it is
fastened to the case with screws. If the case has a shelf ledge that the
power supply sits on, it will be easier to balance.
Make sure that the voltage switch on the back of the power supply is set
to the proper voltage level for your country. North America and Japan
use 110/115v, while Europe and many other countriesuse 220/230v. In most
cases the switch will come preset to the voltage settings for your
region. If the computer already has the motherboard installed into it, the power
leads from the power supply need to be plugged in. Most modern
motherboard use the large ATX power connector that gets plugged into the
socket on the motherboard. Some motherboards require an additional
amount of power through a 4-pin ATX12V connector. Plug this in if
A number of items reside within a computer case that require power from
the power supply. The most common device is the various hard drives and
CD/DVD drives. Typically these use the 4-pin molex style connector.
Locate the appropriate sized power leads and plug them into any devices
that require power.
At this point all of the installation and wiring should be completed
with the power supply. Replace the computer cover or panel to the case.
Fasten the cover or panel with the screws that were previously removed
to open the case.
I think you have just about covered everything by testing the hardware out on a different system. The only vital thing that you haven't checked is the PSU (Power Supply Unit).
Get another power supply of the same type and try that in your system as faulty PSU's can cause these problems even though the motherboard is showing that power is being received, it could be showing a false positive.
Please let me know how you get on and if i can provide anymore assistance.
The wattage rating is the maximum power draw that the power supply can supply. If the system only requires 200W, only 200W will be delivered by the power supply. It is recommended that the power supply rating be higher than what you expect to draw so that you never draw more than 80% of the total capacity. In other words, if you expect to draw 240W total, use a 300W power supply.
recheck all connections, make sure the switch on the back of the power supply (if it has one) is set to the on position. there is a chance the motherboard has failed. with the power off examine the capacitors on the motherboard, especially the ones near the cpu. if they feel rounded on the top they have failed. unless you are good at soldering... consider buying a new motherboard.
you have to be sure about power check outlets power and power supply with power supply tester you can get that on any computer store i get mines from fry'z electronics after you check that probably not have to do any other test to me is the power supply if any of the out lines from power supply is bad you can have that problem the out lines have 12v 5v 3.3v and 3v so check that
Did you try and change the power supply? Maybe the power supply is faulty since u say it keeps rebooting. Since you do not see anything on the screen (the bios is not executed, could b a problem with the power supply. Do you get any beeps?)