How did you possibly remove the bios and cmos? When a computer tries to start like that, often it is the power supply that is faulty. I have changed many power supplies that seem to work OK but when you check them with a tester, one of the voltages is not working - usually the 5 volts. Sometimes the lights on the front of the computer come on, but nothing else happens. Take it to a shop and have them test it, it is a simple plug they put on the wires to see if the power supply is working properly.
SOURCE: my pc will only start for a couple of secounds the
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 there probably old and 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 or just replace them they are probably old and faulty ?
hope this helps
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