Sager 9860 Overheating?

Hello there, I'm new here. I own a Sager 9860 and the weirdest thing happened. I turned it on one day and it didn't work. It gets to the windows xp logo, and the progress bar gets stuck after 5 seconds. I was told that it could be the hard drive, so I got a new one but the It didn't work either. I was going through the process of reinstalling windows xp on the new harddrive, and everything was taking a long time, until the screen ewnt blank and the computer started beeping like a phone, beep...beep ...beep. So I turned it off and when it was rebooting the ram memory test started taking a very long time I have 1024 and it took like 2 mins. So I turned it off and waited a couple of hours and then the ram test was normal, but after maybe 1 mins of going with the xp installation I got the same problem again. I'm pretty sure that it is overheating, and not just that, I can hear that one of the fans is loose and it might be not working. I really need some help here. I live in NYC and there are no reliable laptop repair shops, I took it to one yesterday and the guy didn't know a thing. I would like to open the laptop and check the cooling system, Ive worked with laptops and circuits before but Ive never opened a Sager laptop before. Does anyone have an "easy guide" or some pointers on how to open? I would really appreciate that. I called Sager and its too expensive to ship all the way to cali and pay for labor and parts.
Thanks !
Here are the specs on the laptop

17" WSXGA+ (1680 x 1050) Active Matrix Wide Screen Display (Glossy Screen)
3.0 Ghz Intel Pentium 4 HT (PLGA775) Processor w/ 1MB cache
256MB Dedicated nVidia Video GO 6800 Graphics Card (upgradable) 16x PCI-Express
60 GB Hard Drive (7200 RPM)
1024 MB DDR SDRAM (533 MHz, PC-4200, Dual Channel) (2 x 512 MB)
External USB Floppy Drive
Internal 8X DVD / 24X CDRW / 24X CD Combo Drive w/ Software
HDD RAID Settings - Off
Built in 56k V.90 Modem
Built in 10/100/1000 Fast Ethernet / LAN Network Card
Smart Lithium Ion Battery (12 Cells)