It sounds like either the battery is dead (likely, it’s *old*), and/or you aren’t waiting long enough for the boot process to complete. The 3g was fairly slow to boot. If the logo is on, it’s still booting.
The sensors for face ID (including the front-facing camera) are on the “dip” on the front screen that surrounds the speaker. So water in the top of the phone is indeed a likely culprit. IF the water is in front of those sensors (given that they are infrared light based, and water is a poor transmitter of infrared light), then a cleanup could do the trick. Ask them what they mean by cleanup, including price.
The “data corruption” 3 beep pattern during the power-on self-test means that you (most likely) still have the wrong (or static-electricity damaged!) RAM. Go to crucial.com and find out what the right RAM is.
The TV work-around suggests that the computer has retained the state of “monitor not working” in software (drivers) or firmware (BIOS as backed up by non-volatile RAM). Try resetting the BIOS to default settings, upgrading the drivers, and replacing the button battery that keeps the RAM and real time clock running when the laptop is powered off. https://www.dell.com/support/article/ca/...-to-use-and-troubleshoot-the-inspiron-15-7559-?lang=en
Your description is consistent with a damaged/displaced connector that can no longer seat the cable connector as it is out of position. Try *gently* pulling the connector back towards where it is supposed to be mounted with the thinnest grasping tool you have (e.g. needle tip tweezers). If it reseats with a click, you should be fine, but keep in mind that you now know it’s delicate and can be pushed back in at any time. Good luck.
There’s not much info to go on with your question, but given that the Logitech Review is mentioned… The Review has HDMI and Optical audio outputs. Intermittent audio can be electronics in the Review, bad cable or contacts, or the TV itself. So it’s time to proceed to fault isolation, going from least expensive to most and stopping when the problem resolves Start by reseating the HDMI cable at both ends; check to see if the contacts are dirty. Try a known working HDMI cable; you don’t need anything special or up to date, as the Review is old and therefore doesn’t take advantage of things like networking over HDMI Use another HDMI source (borrow if you don’t have one) to see if it’s the Review. Finally, see if another HDMI TV eliminates the problem. Keep in mind that the Review is old, and Google no longer supports the Google TV software platform. If the Review itself has failed, you can get a refurbished replacement on eBay. If you are feeling ambitious, intermittent failures in audio that are in the Review...