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My dell dimension 5521's lights 3 and 4 flash, nothing on screen

\015 My dell dimension 5521 computer turns on but there is nothing on the screen. There is nothing wrong with the monitor and the error lights 3 and 4 are flashing green on the tower. Also the computer fan is very loud. What do I need to do to make the computer work again?\015

Answers :

This was most likely a memory issue. Reseating the memory (RAM) should have solved it, otherwise, trying to identify if a memory module is faulty by removing/adding one by one.
The suggested resolution from a Dell service manual:
  • If you have two or more memory modules installed, remove the modules, reinstall one module, and then restart the computer. If the computer starts normally, reinstall an additional module. Continue until you have identified a faulty module or reinstalled all modules without error.
  • If available, install properly working memory of the same type into your computer
Have you tried booting up in safe mode to see if it comes on then. If you can then you will have installed something that isnt working with your computer which is causing it not to boot properly. When you swith the comp on you should see some option ie f2 for boot menu. I think its f8 you need to keep pressing then you will get another menu after a couple of seconds saying boot in safe mode, boot in safe mode with networking, boot windows normally or boot windows in last known working state. boot in safe mode see if it works. Hope this helps.
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