Flashing Caps Lock for Dell 1420 and won't start.

Start the computer in safe mode. See what happens.

Hello Linda,
The flashing "A" sounds as though you have the caps lock on. Try hitting the caps lock key to see if it will go off.
Thank You,
Dell-Jesse L
Dell Social Media and Communities

When the caps lock light flashes, it means there's a problem with the memory. Try re-seating the memory by taking it out and putting it back in.

what happens when you try to start/boot the laptop? Take note if the num lock, caps lock, scroll lock are blinking, off, or steadily lit up. If the system does not turn on at all, try to remove and reconnect the memory modules, the hard disk and CD/DVD drive and try to turn on the laptop using only the adapter and test it as well using only the battery. Let us know how it goes

The issue could be due to various reasons such as corrupted display drivers.
Visit the below link for more information
http://notebook-solutions.blogspot.com/2009_07_05_archive.html

Here is the answer. Memory Problem:http://www.laptop-junction.com/toast/content/dell-caps-lock-light-flashing-blinking

Hi
You probably have a mother board issue. Most likely the video chip. Take this to a reputable repair person or check my website www.micromendllc.com.

The flashing padlock should have an "A" in it. That is the caps lock. The flashing caps lock indicates a problem with the memory slot. Try removing memory and replacing. If it continues and you have two modules, take both out and try one at a time. One of your memory modules or slots might have gone bad

It is the caps lock  I don't know why it is flashing though

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.