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Could be bad ram,hard drive or possibly a bad display panel or video card.Try using different ram and removing the hard drive then try it.Also,connect it to an external display and see if it shows video or not.If after trying these things it still isn't showing let me know and i'll try to help more.
try sensing if your cpu fan is working, it is under the power switch side, you can see small exhaust slots, put your hand beside it and feel if some air is coming out when you turn on your pc.
When you turn you pc on and only orange light blinks, it means that no power was getting into it, it blinks because no electrical power is coming from your power adapter and the battery is drained. Check your power adapter cable, this is the very cause why your pc is shutting down. usually the wire from the adapter to the pc is faulty.
It's unfotunate that you don't have the info from the blue screen, this would help tremendously. The blinking light is actually a code, a certain light will blink a certain number of times for a specific code. Go to Dell's support site and find the light codes for your machine, this will help in narrowing down the problem area. I believe you're going to need the tools to remove the covers, so you might think to pick them up. A majority of the time this type of problem is either with the memory or the hard drive. Start with the codes list, and gofrom there. If you need any help, just ask.
Right click anywhere on the desktop, open the screen saver tab, click on the power button at the bottom. You'll see a box that reads monitor, set this to never. That should take care of the screen shutting down. As far as the orange light, I'm guessing that's the battery light, and it's time for a new battery.(It should be green and flashes orange when the battery no longer works properly)