Let $a_{i}$ and $b_{i}$, where $i \in \{1,2, \dots, 2005 \}$, be real numbers such that the inequality $(a_{i}x-b_{i})^{2} \ge \sum_{j=1, j \not= i}^{2005} (a_{j}x-b_{j})$ holds for all $x \in \mathbb{R}$ and all $i \in \{1,2, \dots, 2005 \}$. Find the maximum possible number of positive numbers amongst $a_{i}$ and $b_{i}$, $i \in \{1,2, \dots, 2005 \}$.
1. **Define Variables and Rewrite the Inequality:**
   Let \( n = 2005 \), \( A = \sum_{i=1}^n a_i \), and \( B = \sum_{i=1}^n b_i \). The given inequality is:
   \[
   (a_i x - b_i)^2 \ge \sum_{j \neq i} (a_j x - b_j)
   \]
   This can be rewritten as:
   \[
   (a_i x - b_i)^2 \ge \sum_{j \neq i} (a_j x - b_j)
   \]
   Expanding and simplifying, we get:
   \[
   a_i^2 x^2 - 2a_i b_i x + b_i^2 \ge (A - a_i)x - (B - b_i)
   \]
   Rearranging terms, we obtain:
   \[
   a_i^2 x^2 - (2a_i b_i + A - a_i)x + (b_i^2 + B - b_i) \ge 0 \quad \forall x \in \mathbb{R}
   \]

2. **Case When \( a_i = 0 \):**
   If \( a_i = 0 \) for some \( i \), the inequality becomes:
   \[
   b_i^2 \ge \sum_{j \neq i} b_j
   \]
   This implies:
   \[
   b_i^2 \ge B - b_i
   \]
   Solving for \( b_i \), we get:
   \[
   b_i^2 + b_i - B \ge 0
   \]
   This quadratic inequality holds if \( b_i \) is sufficiently large. However, if \( a_i = 0 \), then \( A = 0 \) must hold, and \( b_i \) must be large enough to satisfy the inequality.

3. **Case When \( a_i \neq 0 \):**
   If \( a_i \neq 0 \), the inequality is a quadratic in \( x \) with leading coefficient \( a_i^2 > 0 \). For the quadratic to be non-negative for all \( x \), its discriminant must be non-positive:
   \[
   (2a_i b_i + A - a_i)^2 \le 4a_i^2 (b_i^2 + B - b_i)
   \]
   Expanding and simplifying, we get:
   \[
   4a_i^2 b_i^2 + 4a_i b_i (A - a_i) + (A - a_i)^2 \le 4a_i^2 b_i^2 - 4a_i^2 b_i + 4a_i^2 B
   \]
   Simplifying further, we obtain:
   \[
   4a_i A b_i \le 4a_i^2 B - (A - a_i)^2
   \]

4. **Summing Up the Inequalities:**
   If all \( a_i \) are positive, we can divide by \( 4a_i A \) and sum over all \( i \):
   \[
   b_i \le \frac{a_i}{A} B - \frac{(A - a_i)^2}{4a_i A}
   \]
   Summing these inequalities for \( i = 1, 2, \ldots, n \), we get:
   \[
   B \le B - \sum_{i=1}^n \frac{(A - a_i)^2}{4a_i A}
   \]
   This implies:
   \[
   \sum_{i=1}^n \frac{(A - a_i)^2}{4a_i A} \le 0
   \]
   Since the sum of non-negative terms is zero, each term must be zero, implying \( A = a_i \) for all \( i \). This leads to a contradiction unless \( a_i = 0 \) for all \( i \).

5. **Conclusion:**
   Therefore, we can have at most one \( a_i \) that is non-positive, and the rest can be positive. This means we can have at most \( 2n - 1 = 4009 \) positive numbers among \( a_i \) and \( b_i \).

The final answer is \( \boxed{ 4009 } \).