PS2 Slim making a grinding noise

Deven - do you know how much a new one of those worm things cost?

I normally buy off Amazon

Having such problems with the PS2 Slim models is way less commplicated than with a FAT model. After working on a FAT PS2 TWICE, having the same issue with a laser without being able to fix it I switched to a Slim model instead and had way less problems.

But back to your problem: Since I can't watch the video as the link says the video was taken down, I'm assuming the grinding Sound happens either when your ps2 is "standing" (vertical) while being started (when the laser goes to it's starting/reading position) - which would mean you either need a new laser motor or the worm gear needs to be lubricated -

or, if its a "clicking" noise WHILE reading a disc it could mean that your laser is dying.

You still need to take your PS2 apart to fix either of these problems. But trust me it isn't that hard (even I could do it after watching a short youtube video)

+ you could test, if your date/time battery is dead (if you set the time on the ps2 and the glowing orbs on the menu don't fly around, your battery is dead)