Find all real numbers $x$ such that the expression
\[\log_2 |1 + \log_2 |2 + \log_2 |x| | |\]
does not have a defined value.
To find all real numbers \( x \) such that the expression
\[
\log_2 |1 + \log_2 |2 + \log_2 |x| |
\]
does not have a defined value, we need to analyze the conditions under which the argument of any logarithm is non-positive or undefined.

1. **Innermost Logarithm Analysis:**
   \[
   \log_2 |x|
   \]
   For \(\log_2 |x|\) to be defined, \( |x| \) must be positive, i.e., \( x \neq 0 \).

2. **Second Logarithm Analysis:**
   \[
   \log_2 |2 + \log_2 |x| |
   \]
   For \(\log_2 |2 + \log_2 |x||\) to be defined, \( |2 + \log_2 |x|| \) must be positive. This means:
   \[
   2 + \log_2 |x| \neq 0 \implies \log_2 |x| \neq -2 \implies |x| \neq 2^{-2} \implies x \neq \pm \frac{1}{4}
   \]

3. **Outermost Logarithm Analysis:**
   \[
   \log_2 |1 + \log_2 |2 + \log_2 |x| |
   \]
   For \(\log_2 |1 + \log_2 |2 + \log_2 |x||\) to be defined, \( |1 + \log_2 |2 + \log_2 |x|| \) must be positive. This means:
   \[
   1 + \log_2 |2 + \log_2 |x| \neq 0 \implies \log_2 |2 + \log_2 |x| \neq -1 \implies |2 + \log_2 |x| \neq 2^{-1} \implies |2 + \log_2 |x| \neq \frac{1}{2}
   \]

4. **Solving the Condition:**
   \[
   2 + \log_2 |x| = \frac{1}{2} \implies \log_2 |x| = \frac{1}{2} - 2 = -\frac{3}{2} \implies |x| = 2^{-\frac{3}{2}} = \frac{1}{2\sqrt{2}} = \frac{\sqrt{2}}{4}
   \]
   Therefore, \( x \neq \pm \frac{\sqrt{2}}{4} \).

Combining all the conditions, the expression is not defined for:
\[
x = 0, \quad x = \pm \frac{1}{4}, \quad x = \pm \frac{\sqrt{2}}{4}
\]

The final answer is \( \boxed{ x = 0, \quad x = \pm \frac{1}{4}, \quad x = \pm \frac{\sqrt{2}}{4} } \).