My computer wouldn't turn on so i replaced the PSU, motherboard, RAM, and hard drive. what is my next step? and i didn't replace the parts with the same manufacturer. i started with Emachine and used Biostar replacement parts.
I assume you have the fan of your power supply working indicating that power is OK. Disconnect everything from the motherboard leaving only the processor, fan and power. If you don't hear any beep means that you have a problem with either the motherboard or the processor. PS Verify compatibility of motherboard FSB and processor.
If this computer was working before and now you don't have any beep means that the motherboard or the processor are bad. In the process of replacing parts you should verify the compatibility of your motherboard with the processor and the memory, everything else is not critical. To this check you need to know the motherboard type (Usually is written between the PCI connectors) like in this picture then you have to find the manual in internet and you can see the FSB (Front System Bus) speed. Same thing with the processor, on top of it there is a number that if you put in Google will give you all the details. Look for FSB and see if it's the same of your motherboard. On the same manual of your motherboard you will also find what type of memory you can use. If you find this procedure too heavy, just send me the numbers of motherboard and processor and i will find the documentation for you. 
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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 if this fails to fix the problem
another possible reason could be a memory dump you might be running to many programs at the one time placing to much strain on the CPU also you might not have enough RAM random access memory hope this helps
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
follow the troubleshooting procedure a computer needs all of the data and electrical current to travel through every 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 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 hope this helps also it could be a dirty computer clean all of the dust from your computer you could use a vacuum cleaner but whatever you use make absolutely sure there is no moisture gets to anything in your computer
also check the Cmos battery and computer ram make sure they are securely seated
hope this helps
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
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 hope this helps
Test or replace your PSU power supply unit preferably with a heavy duty one with plenty of wattage remembering that with any added hardware your computer will use more power/wattage eg:more RAM ,bigger hard drive,slave drive
One bad/faulty lead can cause a computer with lots of problems continually rebooting or failing to detect your drive
replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA the ones that attach from your motherboard to hard drive
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps?
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i tried disconnecting everything and i did not hear any beeps. and how do i check the compatibility of the motherboard FSB and processor?
i even took it to a firedog specialist and he wouldn't even touch it!
i think it is time to get a new computer and throw this one out the 3rd floor window!
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