I fear that your PC may never work again, and all because you didn't follow the suggestions here.
Now that you are armed with all this advice, your best "solution" would be to make a claim on your Household Insurance Policy for a brand new PC
Start off by making a claim under the "Flood Damage" section of your policy - there haven't been too many floods in the UK this year, ( like there were last year ), so there will be lots of cash in the kitty waiting for someone to claim it.
The insurance company will really look forward to settling your claim.
If you don't have a Flood Damage section, try claiming for damage caused by "Rising Damp"
Once you have the new computer make sure you do everything that has been suggested, but don't forget to renew that Insurance Policy first - "Just in Case"
( The premiums might go up a tad - but you can always shop around using a comparison web site such as
www.comparethedimwit.com )
You should soon be back up and "running", with "streaming" video, smooth "flowing" graphics, and superb quality audio "waves".
