I have a dell inspiron (5737, I believe) Turned it on one day and the screen was white. Fiddled with it for some time and finally got it to connect to a TV. Then I turned it on the next day,it was now white AND beeping. Tried all the online troubleshooting, spent almost 2 hours turning it on and off, holding the d button, ctrl alt del-ing, and just plain smashing buttons. Somehow got it to connect, but here I am again, trying to get it to connect, but it won't stop beeping. Ctrl all del-ing makes the screen turn black for a few seconds before it goes white again and beeping.
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Use a repair-shop. You might have had an electrical surge that caused some damage. – harrymc Jun 29 '21 at 08:56
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Don't go to a repair shop (yet)! I doubt it was an electrical surge, more likely its just technology doing what its always slowly but surely doing... breaking down! :-)
Start with the basics... turn it on and just listen to/make note of the beeping. These are called "beep codes" and its telling you whats wrong, what you hear should correspond to one of the codes in this table -
It might sound like endless beeping, but I'd guess its actually 8 beeps, which means LCD failure. Meaning, it's eBay/AliEpress parts shopping time, new laptop shopping time, or you could try live with an external display only.
Edit: "LCD failure" could just as well mean a dodgy/loose connection to the LCD. So before doing any shopping, check all the internal conections from the mainboard to the LCD, and it might come good.
user1138
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Hi. I'm trying to use an external monitor, but there is no connection showing. Yes, it is 8 beeps. Messed around inside the laptop, so now it's black screen and beeping. – Lana Jul 03 '21 at 11:33
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To get an external display going - wait for the 8 beeps to finish, then press the F1 key or Fn + F8 (switch display) function keys to toggle to external (it could be either I'm not sure). The LCD is probably blank now because you have either dislodged (or broken) the LVDS/Display cable. Try re-seating the cable at both ends. Given you had it working on a TV before, I still suspect it's either a dodgy LCD and/or loose/broken LVDS cable, however if either of the above actions don't work for you, it might be the case that the onboard video was failing, and has now completely failed. – user1138 Jul 04 '21 at 04:33