Here are some steps you can take to troubleshoot a computer that freezes during startup:

1. Check if you have any newly installed software or hardware on the system.
2. Try to reset the computer to the last known good configuration.
3. Check for any damaged hardware or RAM modules.
4. Resolve any incompatibility issues between hardware and software components.
5. Update any outdated drivers or remove any unnecessary programs.
6. Perform a system restore to an earlier date.