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If you are increasing the RAM from 1Gb to 2Gb then the RAM maybe incompatible. Try using a RAM module as the original make and speed. Try installing one RAM module at a time to see if one of the RAM modules is faulty. Removing the RAM will give a POST error code of no RAM or faulty RAM.
Look at the HDD (Hard Disk Drive) LED light...
Is it a steady red? Put your ear to the computer case. Do you hear a repeating clicking sound?
You should be able to press [F10] to get out of the BIOS Setup. If not, it may be a loose hard drive cable (open up the PC) or a failing Hard drive (replace).
Flickering LED means power supply is overloaded with something. It might be inside of the supply, but sometimes it is something else. Try that: 1. Disconnect everything from the motherboard except power supply and power button; 2. Disconnect all power connectors from all drives; 2. Remove any cards from the motherboard so all you have is power supply and motherboard with CPU and RAM, nothing else. You can keep connected the monitor and keyboard; 3. Press Power button. Will motherboard turn on normally?
If no - check electrolytic capacitors especially around the CPU, if some of them are "popped" replace them. If yes - connect drives and cards one per time to localize the problem.