fully charge and hold down the button for 30 secs ... this has helped with my own device. also depending on how long you've had the kindle... check out the recent recall for chargers that were said to have problems. theres a serial on the side that can be quoted to be sure its not included or can be replaced for free. http://news.sky.com/story/1652016/kindle-charger-recall-over-electric-shock-fears

could try a new or refurb tablet on ebay for a reasonable price and have spare parts for replacements. http://www.ebay.co.uk/sch/i.html?LH_BIN=...

Start your computer up and as soon as the boot screen appears - tap the 'F8' key a couple of times. this will take you to 'Safe Mode' options screen. in safemode its possible to uninstall any program that may have caused an issue, use system restore to an earlier date when all was ok... or make other configurations such as msconfig (entered into run). the start tab on the window allows users to disable suspect programs from starting up at boot. alternatively: pressing 'F8' takes you to the 'Safe Mode' options screen, scroll down using the Up and Down arrow keys and select 'Last good configuration', then press 'Enter'. with any luck, it will boot normally from the last good set-up and all you will have to do is re-install a few recent updates.

ive used a 1TB western digital drive for mine and used this guide to make the install. iMac Intel 27" EMC 2390 Hard Drive Replacement HDD http://eshop.macsales.com/item/Western+D... vids available on youtube for guides also.

Hold the button for a full count of 30 seconds, and it should reboot. be sure to have a full charge.

replace the AC charger or the battery. use the details on the devices to enter in to a search online. ebay?

sounds as though the machine does not boot up. remove battery, devices and unplug from wall. hold the start button 20 secs to discharge all residual energy and replace all. reboot again to see if the machine responds.

you are describing a range of issues but the priorty would be the monitor and lines problem. this indicates either a problem with the graphics card or the monitor. try connecting the monitor to another machine (if available) to test if working ok. if not, the monitor is the culprit. as for the slowness of the HP uninstall unwanted programs from, control panel (put in search) look for uninstall programs. check microsoft site for updates and update programs and browsers. use the AV to run scan for malware. run scan with MWBs https://www.malwarebytes.org/antimalware... run scan with Adwcleaner http://www.bleepingcomputer.com/download...

record all the personal details and backup crucial data on to a pc/laptop and reset the tablet to a factory fresh start again. tablets are quicker to reinstall the system and less bother then computers. look into the tablets settings for the factory reset option.

depending on the make and model of your machine replacements can be bought from most tech stores and also ebay. see this link as an example: http://www.ebay.co.uk/bhp/micro-usb-port a search can be made if the specifics are known.