Howdy! My name is ***** ***** I'll be assisting you today.
As far as the Dell problem, t sounds like Windows is telling your computer to load up it's brain innards from a USB device. There is probably no USB device to boot from iso it is just stuck there thinking.
To fix this, shut the Dell down and follow these steps:
1. Power on the system.
2. While the blue Dell logo is visible, press the < F2 > key to enter the System Setup.
3. Press the < Num Lock > key, and verify that the Num Lock light is on.
4. Press the < Caps Lock > key, and verify that the Caps Lock light is on.
5. Press the < Scroll Lock > key, and verify that the Scroll Lock light is on. The lights on the keyboard should all be illuminated as in Figure 1.
6. Press the < Alt >+< F > keys at the same time. The system will beep as the setup defaults are restored.
7. Press the < Alt >+< B > keys at the same time to restart the system. The changes are automatically saved.
For all intents and purposes, this SHOULD fix that nasty little issue. Let me know if it doesn't.
Now, for your HP - what exactly is wrong with it? Will it turn on at all? Please let me know.
And if you this worked for the Dell, at least, if you don't mind rating my answer with a 3 star rating or more, i'd appreciate it. That's how we get credit for the question being answered.
Even so, I am here and will help you and will be around all weekend if I must!