My PS2 Slim will not start. The power on light is

Ps3 Yellow/Red/Green Light Repair Guide

try this:
1. turn off PS2
2. unplug PS2
3. plug PS2 back in
4. turn on PS2

hope this helps.
it's from the manual :D

well first of all your only supposed to press it. dont hold down. i dont really know why, but i suppose if anything something having to do with the power cord. proud to be part of your help
-brandon

check the connection, if you have the ps2 plugged in and it wont turn on it would be best to return it or have someone look at it.

i checked the manual (troubleshooting) 1. turn off PS2 2. unplug it then, plug it back in and turn it on(andprayitstillworks).

Hi, I had same problem, I just changed the fuse underneath mainboard, 3.15 Amp 120V If it doesn't work change this for 4AMP fuse

you should try to leave without any power connection a long time about a day then see if it works or not....

usually, there is a problem with a ribbon cable of power/reset switch. Try using a replacement ribbon of the same type.

Hi NateQ, Sorry about no one paying attention to your problem for so long. I just got started about a month ago. I have been repairing video Game consoles for over a decade though. Your problem is that your slim has a melted down laser and lens assembly. The unit is dirty. You will need a new disc drive and a thorough cleaning to get it back in service. The problem about the power light is due to excessive dust buildup shorting out the components on the motherboard. The video output is also comprimised by dust and dirt. The disc spinning is possibly comprimised by hair wrapped around the disc drive spindle. If you want, I can thoroughly detail clean your PS2 slim and replace the disc drive for $38 plus shipping both ways. Contact [email protected]

http://www.cdrom-guide.com/forums/archive/index.php/t-179062.html heres the link: