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My HP a420n won't start after replacing cd-rw drive

\015 My HP a420n was working fine.To replace the cd-rw drive with a dvd-rw drive I turned the computer off, removed the power cord and replaced the drive (I wore an anti-static wrist band). I then pushed the power button - and nothing happened. No fans moving or noise of any kind.The power is on to everything else (monitor, speakers, Linskys modem & router, etc.)I am now using our old Dell with the Linksys adapter.So I removed the new dvd-rw drive and re-installed the old cd-rw. Still now power. I then removed that drive and left the drive slot empty. Still no power.There is a green light blinking in the back of the tower. When unplugged it blinks slowly but speeds up when I connect the power cord.I read where this may only mean the the network is active.I have checked and re-checked all of the connections and now have no idea what to do.I hope this does not require a new power supply. I already spent $240 including installation for a new hard drive about 6 months ago. Any help will be greatly appreciated.jim\015

Answers :

Please try to remove all the connections from your computer and also connections inside the motherboard, the power cord for your hard drives and also the power cord from the power supply to your motherboard.After that, remove the memory and clean the pin by using an eraser of the pencil. And then insert again the memory stick and connect all the connections from the power supply to motherboard and everything. Lastly reset your bios and put it back to normal again. Hope this would help. Thanks..
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