I got 2 x dp35dp which both are very slow booting once in a while. I have to turn tho power completely off for some minutes and wait until I turn it on again.
Bear in mind that the motherboard you have is quite old, which may have a performance loss because of the lifetime, however you can try doing a clear CMOS, which will clean up the data that is stored on the BIOS chip (embedded on the motherboard). Follow the steps below to do the clear CMOS process:
- Shut the system down.
- Disconnect the AC power.
- Remove the CMOS Battery from the CMOS.
- Wait for 15-30 minutes without the battery on the motherboard
- Refit the battery.
- Reconnect the AC power
Hopefully the recommended step will resolve your issue.
If you have more questions please let me know.