I press the power button, and the 3 lights at the top (CAPS,NUM,SCROLL) all blink once, but the laptop does not power on. (no fan, no boot, no noise)
The LED light in front do light up, but other than that, nothing!
Also, my power cord frayed recently and fried my battery. But I have been running on AC since, with no problems. Any help would be apprieciated!
I would check the RAM in the laptop and see if it is not seated properly. You should have 2 areas that hold #1 RAM Chip
One under the keyboard and one on the bottom. I had a Dell Latitude D620 and the ram was not seated properly and I received the same error.
I hope this helps
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Remove 1 stick of ram and turn on, if no! take out the second one and put back the first, and power on, if okay you know the 1 stick is bad. Remove main battery and power on, "long shot" if no change chances are it is a motherboard issue.
Looking at your laptop from the front the first light on your Right hand side is your scroll lock light and is only on when you press the scroll lock button (the symbol shows a lock with a little down arrow)
The light to the left hand side of that light is your caps lock light and again only turns on when you press the caps lock key (The symbol shows a lock with a A in it)
The light to the left hand side of that is your numeric keypad light (Symbol has a lock with a 9 in it), this comes on when you press the num lock key on your keybaord
Finally the last key is your hard drive light (like a cylinder), this will be flashing most of the time as you use your PC as it is constantly reading and writing data
If the Num lock is lit constant, and the Caps Lock and Scroll Lock keys are flashing, the system is reporting a memory error. Power off the system, remove the battery, and follow the user manual from support.dell.com to reseat the memory module(s). If the error persists, you may need to replace the memory and/or the system board of the portable.
The 3 LED's (Num Lock, Caps Lock, Scroll Lock) are used by Dell to diagnose no-post issues such as yours. The only error code close to yours is [Num Lock ON, Caps Lock FLASHING, Scroll Lock ON]. This indicates a a memory error. Try reseating the memory modules. If you have 2 memory modules, insert one at a time to determine the faulty module.