Restart the computer and immediately start pressing the F8 key, once per second, till you see a selection screen. Once there, use the up/down arrow keys to select "Safe Mode", the press the "Enter" key. If it boots to Safe Mode correctly, then you may have driver issues for various hardware, such as the graphics card, the BIOS, or possibly something more serious. If it still doesn't boot correctly, then you need to pay better attention to the way the beeps are occurring.
The cap lock blinking errors are listed in the link below.. You need to count the TOTAL number of blinks you get.. There can be a total of up to 6 blinks per startup for the errors listed. Read the explanations for each error at the bottom of the screen. It may help your understanding of the beeps codes.
Hope this helps.
I have an HP Pavilion dv7 4270us. The computer sounds like it is going to boot up and just goes to a black screen. The caps lock blinks once every 3-4 seconds. I looked up the blink codes but don't understand what they mean. For example blink code 1 (CPU problem). But it doesn't say what they mean by blink code 1. Does that mean one blink every second? Is blink code 3 once every 3 seconds?