When it makes a lot of noise, does the blue LED flash like mad?
Also, are you able to get the disc out of the drive when you press eject?
Final question would be, does the little clock in the corner turn when your disc is in the drive, as if the PS3 is attempting to read it?
That should help narrow down the problem.
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)