When I turn the system on it shows the "GATEWAY" logo. Then goes to another screen and says "enter password" but I forgot the password.

check your hard drive connections

Hi
Password for user,
1- if its windows 7 then do two times ctrl +alt+del then enter user:administrator without password
2- if its windiws 10 then see this link
https://youtu.be/P50PQwiYNec
Hope this can help you.

you will have to google the make/model. I recommend you use Gateway instead of compaq as only gateway results show if the model-only is googled. I don't believe that is a compaq, nor does it follow their normal 'naming' schema.

Once you locate the manual you will search it for the BIOS password reset instructions. That model may also have the Hard drive locked, once you are able to enter the BIOS you can follow the manual's instructions to look-for, and if found, clear any Hard drive password.

Note: Clearing the BIOS passwords will have no effect on any Operating System password on your User Account, (if any.)

Resetting the System Password
If you forget your password and still cannot remember it after seeing your hint, click the I still can't remember the password link.
The Reset System Password page opens.
To obtain access to your system:
1. In the System Key field enter the 10-digit system key located on the bottom of your gateway.
2. In the Enter New Password field, enter a new system password. In the Confirm New Password field, reenter the system password.
3. In the Enter Your Hint field, enter an appropriate hint as described under "Setting a System Password" .
4. Click Submit.
Setting a System Password
Setting a system password protects your gateway settings from being modified or changed by someone who has not been given permission to do so. After setting a system password, you will be required to enter it whenever you attempt to access a gateway configuration page - for example, if you try to change the gateway's broadband connection settings or upgrade the gateway software. If a password has not been set,
a reminder notice is displayed when you attempt to access pages where settings can be changed.
To set your system password:
• Open a Web browser and access the gateway user interface by entering
http://gateway.2wire.net.
• Click the System tab.
• Click the System Password link in the System area of the Network at a Glance panel to open the Edit
System Password page.
1. In the Settings panel, click the Enable checkbox.
2. In the Enter New Password field, enter your password.
3. In the Confirm New Password field, re-enter your password.
4. Optional: In the Enter Your Hint field, enter a hint.
A hint is a word, phrase, or question that reminds you what the password is. There is an I forgot the password link on the password entry page. When you click this link, it shows you your hint and allows you to enter your password.
5. Click SAVE.

Hi.

1. Remove all CDs or DVDs from the optical drives.
2. Turn off the computer, using the normal Windows shut down process.
   
3. After the computer is turned off, disconnect all USB devices except the keyboard and mouse. This includes USB devices such as a printer, scanner, removable storage, or camera.
   
4. Turn on the computer. After the Gateway BIOS logo appears, repeatedly press the F8 key. The Advanced Boot Options menu opens.
   
5. On the Advanced Boot Options screen, use the arrow keys to select Repair your Computer, and then press the ENTER key.
   
   
   
6. In the System Recovery Options dialog box, select the appropriate keyboard layout, and then click Next.
   
   
   
7. In the System Recovery Options dialog box, click the down arrow to select a user account that has Administrator rights, then click OK.
   
   Note: The Administrator account is disabled by default.
   
   
8. In the System Recovery Options window, select Recovery Manager.
   
   
   
9. In the Gateway Recovery Center window, click Next.
   
   
   
10. In the Gateway system recovery window, select Full factory recovery.
    
    
    
11. In the All data will be lost window, select Yes, and then click Next.
    
    
    
12. The Windows partition is formatted and Windows is installed.
    
    
    
13. In the Recovery is complete window, click Finish.
    
    
    
14. In the System Recovery Options window, select Restart.
    

When the computer restarts you will need to set up the laptop again.

Good luck.

Something to try:

Power Off computer. Turn it back ON then when you see gateway logo start tapping on the F8 key and it will take you to Windows Advanced Options. Select safemode and press enter. If it ask you to select a Operating System just press enter. You will see white text. Once you get to the icons on your desktop It will state that it is running in safemode click on yes, then go to
Start Menu then All programs then Accessories then System tools then System Restore. Select to restore to an earlier date then in the calendar select a bolded date at least a week ago. Follow the prompts and your system will restart. This does not hurt to try. Hope that helps.

If you have it, reinstall the software. If you don't, type in the model and find the drivers and info online.

I found this on this site:
2Wire 2700HG-B Setup
1. Connection of phone line, ethernet and power adapter
2. Indicator light: POWER: green; Ethernet: blink; DSL: green; Internet: blink or red
3. Open IE beoswer.
4. address: 192.168.1.254
5. Click "Run System Setup Wizard"
6. Login with preset password: admin. Or change password: click "I forgot the password." Under question "Here’s a hint for the password wedding date", click "I still can’t remember the password.". Then Reset System Password by enter System Key which locate on back of the Router (like: [1234567890]), and your new password, then click "Submit"
7."Set Up Your 2700HG-B Gateway" screen. Keep default "Key Code". Click "Next"
8. "Time Zone". Select your time zone,then click "NEXT"
9. "Set Up Connection Info". Enter "PPP Authentication" information provided by internet service provider. "Username", "Password", and "Confirm Password", then click "NEXT"
10. Screen "Connecting" running...
11. Auto turn to screen "2700HG-B Gateway Setup Complete", click "FINISH", or "EXIT" to complete setup or "Register" to register with 2WIRE on line.

2Wire 2700HG-B Setup
1. Connection of phone line, ethernet and power adapter
2. Indicator light: POWER: green; Ethernet: blink; DSL: green; Internet: blink or red
3. Open IE beoswer.
4. address: 192.168.1.254
5. Click "Run System Setup Wizard"
6. Login with preset password: admin. Or change password: click "I forgot the password." Under question "Here’s a hint for the password wedding date", click "I still can’t remember the password.". Then Reset System Password by enter System Key which locate on back of the Router (like: [1234567890]), and your new password, then click "Submit"
7."Set Up Your 2700HG-B Gateway" screen. Keep default "Key Code". Click "Next"
8. "Time Zone". Select your time zone,then click "NEXT"
9. "Set Up Connection Info". Enter "PPP Authentication" information provided by internet service provider. "Username", "Password", and "Confirm Password", then click "NEXT"
10. Screen "Connecting" running...
11. Auto turn to screen "2700HG-B Gateway Setup Complete", click "FINISH", or "EXIT" to complete setup or "Register" to register with 2WIRE on line.

try following this instructions..you key should be in the back of your modem router

1. Connection of phone line, ethernet and power adapter
2. Indicator light: POWER: green; Ethernet: blink; DSL: green; Internet: blink or red
3. Open IE beoswer.
4. address: 192.168.1.254
5. Click "Run System Setup Wizard"
6. Login with preset password: admin. Or change password: click "I forgot the password." Under question "Here’s a hint for the password wedding date", click "I still can’t remember the password.". Then Reset System Password by enter System Key which locate on back of the Router (like: [1234567890]), and your new password, then click "Submit"
7."Set Up Your 2700HG-B Gateway" screen. Keep default "Key Code". Click "Next"
8. "Time Zone". Select your time zone,then click "NEXT"
9. "Set Up Connection Info". Enter "PPP Authentication" information provided by internet service provider. "Username", "Password", and "Confirm Password", then click "NEXT"
10. Screen "Connecting" running...
11. Auto turn to screen "2700HG-B Gateway Setup Complete", click "FINISH", or "EXIT" to complete setup or "Register" to register with 2WIRE on line.

taken from
http://reviews.ebay.com/2Wire-2700HG-B-Router-Setup_W0QQugidZ10000000003443668?ssPageName=BUYGD:CAT:-1:LISTINGS:1