Bought a used compaq 1700 I was told that the monitor stopped working so i connected an external monitor to it, added memory and on booting up I receive 4 beeps then nothing. Shows power to the battery and after being on a while the fan kicked in.
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You can switch to anexternal monitor by two methods.1. Connect the externalmonitor to the laptop's video port, power up the external monitor first and thelaptop. The video information will automatically switch to the externalmonitor.2. If you power up thelaptop first then you can switch the video output to the external monitor bypressing the Fn key and one of the Function keys, depending upon your make andmodel laptop. You can also toggle between the external monitor or both LCDscreen plus the external monitor or back to LCD screen only by pressing the Fnkey plus one of the function key. Here is a lkeycombinations for the laptops :-HP and Compaq = Fn + F4
It would be helpful to know if this machine running XP, Vista or Win 7.
Can you hear the CPU beep during boot?
Do the lights come/blink on on the front of the laptop?
All this information is important if you want accurate advice to help solve your problem.
If you have a desktop PC monitor available, connect this to the laptop's VGA port and press the Fn (function) key simultaneously with the F5 or F6 key (the key showing 2 monitors) while booting, to send the image to the external monitor.
If you can see images on the external monitor, then your laptop may have (in ascending order of seriousness/cost of repair), an LCD panel inverter fault/failure, a cold cathode backlight fault/failure, an LCD panel fault/failure, a graphics card fault/failure, a motherboard power management system fault/failure, a motherboard fault/failure.
Power up the external monitor first and then boot up the laptop, the video info will automatically divert to the external monitor. If you do not see a Windows image on the external monitor then it is definitely a motherboard issue, because the video card is built in on the motherboard. The Video card uses shared RAM (part of the RAM module/s ), try re-seating the RAM modules, also test the RAM modules. You can test the hard drive by removing the hard drive and connecting it to an USB hard drive adapter, then connect the adapter into a working computer's USB port. If the hard drive is OK, this computer will see it as an external storage device and you can open the various folders and files on the hard drive.
It is from the mother board which means that there will be some errors on the motherboard ,if the booting is not done in proper way then .The mother board produces beep sounds. better re-install the operating system first , then check that the sound is producing or not , else better contact a compaq service center. they will be able to fix it for you.
Sounds to me like you have a short inside your system somewhere, or you have a faulty display/graphics card is going bad. You will probably have to replace your display and/or graphics card. On most laptops, if they dont have a dedicated graphics card, and they use an embedded one, then the whole screen has to be replaced. if the graphics card Is dedicated, then you probably can just have the card replaced, and not the whole screen.
Most laptops have a video connector that you can use to connect you laptop to an external monitor. connect an external monitor to your laptop and see if anythig comes up on the external monitor.Your laptop has a key to switch between it's own screen and the external monitor.When you use the external monitor ,you'll have to use this key to switch to the monitor.Your battery should'nt matter if the laptop is running on AC.Let me know what happens and we'll go from there.
3 beeps is the Beep code for "Base 64KB RAM Failure". Lets hope that you are lucky and the problem is your memory. If you have two memory sticks in the computer, then try to take one of them out. Try different combinations such as swapping between the memory slots that are available. If you still getting the same error code, then your motherboard is shot.
Typically I have found that it is a connector that is the problem. You're getting power (lights the screen) but you aren't getting a digital signal (Screen Memory Map & Desktop). Check the mylar ribbon cable on the left, that is going under the hinge.
Upon close inspection I found mine had cracked connections. A quick dab of solder corrected it. Not allowing the iron to rest on the mylar long.
If you have one of the older models, and using a pin connector, check the leads, and make sure it is seated correctly.