Inspiron E1505 will not boot- blinking lights info?

I have:

Inspiron E1505, Windows XP, 1GB RAM (2x 512MB)

 

It started having blue screens indicating hardware issues. I first suspected hard drive as sometimes it would boot and run and sometimes it would just give blank screen. Diagnostics  and BIOS sometimes showed hard drive not detected. 

Now- When power button is pressed the NumLock light is solid, the CapsLock and ScrollLock lights blink on and off together for about 1 minute then all lights turn off. I removed RAM, HD, modem, optical drive- same results.

I have not been able to find info on what the blinking lights might mean and I also don't have another SATA 2.5" drive to test with. I have looked through both the manual and service manual.

 

Also, the hard drive screws are missing and *every* screw I checked was loose- I have never seen anything likr it- all the case screws, mounting screws etc- very odd- maybe something internally is just loose?

 

Any info or suggestions appreciated!

 

Om

 

***UPDATE***

 

I searched the forums and found some threads that suggested bad RAM- and sure enough the computer started right up when i used only 1 module. After that I was able to boot using any combination of the 2 modules (using 1 or both modules) Strange! I am now using Memtest bootable CD to see if I can see which module is bad or to see if the cpu is failing. I suppose it could be one of the memory slots as well- hard to tell- and in seeing how much the motherboard and components flex in this laptop I would not be surprised.