Most likely it’s can be your video card does it artifact on the screen also ?

DSi Charger, AC Adapter Charger for Nintendo DSi/DSi XL, Home Travel Charger Wall Plug Power Adapter (100-240 v) https://a.co/d/6kNvae2 Just buy replacement charger my stepsons did that n it was the charger so bought a new one n fixed the issue but buy the cables or charge

Get ya the Silca gel packs off Amazon and put them back in a container for a day and try to see if that works or not and you buy replacement right ear off eBay they 25 bucks per side here’s the link hope this helps https://www.ebay.com/itm/255248521364?mk...-127632-2357-0&ssspo=Ghg4PPi1Rum&sssrc=4429486&ssuid=... and here’s the link for silca gel packets they will take any water out of them Dry & Dry 5 Gram [50 Packets] Silica Gel Packets Silica Gel Desiccant Dehumidifiers, Silica Gel Packs - Rechargeable (Food Safe) Moisture Absorbers, Silica Packets https://a.co/d/2ocCKhC

Have you tried and made sure the drive isn’t going out and is it ssd or hard drive ?

Here’s the part you need https://www.ebay.com/itm/155779889200?mk...-127632-2357-0&ssspo=QOCNJABRTbC&sssrc=4429486&ssuid=... but before you buy a new screen make sure your brightness is up

Hp sells parts online you can order or u can buy off eBay http://h10032.www1.hp.com/ctg/Manual/c05... that’s the Manuel you can also https://www.ebay.com/itm/314734746944?mk...-127632-2357-0&ssspo=yribzy-DS7O&sssrc=4429486&ssuid=XRHYXdyCSXu&var... buy this new fan it’s 11 bucks hp probably charges more but the service manual will have parts number for you to order from hp but to bypass all that I found the part you need and you can also make sure to replace the thermal paste also since you gonna take it apart anyways I’m sure that thermal paste from factory probably dried by now but hope this helps

https://www.ebay.com/itm/352094600209?mk...-127632-2357-0&ssspo=MKvWgI-oS4i&sssrc=4429486&ssuid=XRHYXdyCSXu&var... They 114 with the frame u need the whole part bc it’s harder to replace if you trying to just replace the screen only it’s a lot easier to replace the whole front part besides the screen bc there’s more glue and all that so this is the best way n you save more money also

https://www.ebay.com/itm/313989743776?mk...-127632-2357-0&ssspo=nmfe5h-8sl2&sssrc=4429486&ssuid=XRHYXdyCSXu&var... Here’s a link to the screen you need they 25 dollars one eBay easy fix