Laptop not starting up

[123Ineedhelp]

I have a dell inspiron 1545, today when i was on youtube it started freezing and so i restarted it and it kept doing the same thing, i tried again for the 3rd time and it didnt load past POST. Now when i press the power button, the screen stays black and the button lights up for a couple seconds, shuts off and then lights back up and stays on until i shut it off. The fan turns on and shuts off like the power button and then stops for good until I power it off and on again. I need help!!! I have already tried removing the battery and holding the power button for 30 seconds. The computer also beeped 4 times in segments

 

[rgd1101]

MERGED QUESTION
Question from 123Ineedhelp : "Dell inspiron infinite boot loop"

When I start up My laptop, it shows the Dell logo like it would be starting up, but then the screen goes Black and does it again repeating

Note: If this problem started after an update (or system reinstall), please make sure the laptop is not connected to the internet in any way before you use the following instructions.

Try the following...

1. Power off the laptop.
2. Power on the laptop.
3. As soon as you see the rotating loading circle, press and hold the Power Button until the computer shuts off.
4. Repeat this process a few times until you see the "Preparing Automatic Repair" screen.
5. Now you want to let the laptop boot to the "Automatic Repair" screen.
6. Click "Advanced Options" and then select "Troubleshoot".
7. Here you want to select "Refresh your PC", if you do not wish to erase data, or "Reset your PC" to erase all data and restore your system.
8. From here just follow the screen instructions until the recovery is completed.

NOTE: You will need to get into the "Advanced Options" in order to get the "Refresh Option". This choice will keep your data, but any programs installed will be lost.

Do not do a "Reset" as that will wipe all data you have on the laptop.