OK, so me asking for help... 
Recently I started getting a black screeen with "Invalid system disk...Replace the disk, and then press any key" error at startup.
What could that mean? And when I just press a key, it starts up normally. Everytime my laptop boots, that error comes up, and I press a random key, and everything runs normally again. Weird...









Anybody here that knows what's happening?

Recently I started getting a black screeen with "Invalid system disk...Replace the disk, and then press any key" error at startup.

What could that mean? And when I just press a key, it starts up normally. Everytime my laptop boots, that error comes up, and I press a random key, and everything runs normally again. Weird...










Anybody here that knows what's happening?
My Computer
System One
-
- Manufacturer/Model
- Dell Inspiron 640m Notebook MXCO61
- CPU
- Intel Core Duo T2080 @ 1.73GHz
- Memory
- Dell Memory 2GB
- Graphics card(s)
- Mobile Intel 945GM Graphics Accelerator
- Sound Card
- Dell High Def. Sound
- Monitor(s) Displays
- Dell 14.1" High Res. UltraSharp Notebook Display
- Screen Resolution
- 1440x900
- Hard Drives
- One Hard Drive 120GB
- Mouse
- Logitech V4500 Wireless Notebook Laser Mouse
- Keyboard
- Dell Inspiron 640m Stock
- Internet Speed
- 54MB/s