I replaced the CPU thermal paste and the computer is making a three beeps, but it won’t power up.
I replaced the CPU thermal paste and the computer is making a three beeps, but it won’t power up.
Review the motherboard guidelines to discover the meaning of the three beeps, then you'll identify the problem and can fix it. It’s probably overheating because the mount isn’t secure, so double-check that the cooler is correctly installed after changing the thermal paste.
Overheating seems unlikely because the device emits three beeps without starting. If the person forgot to connect the cooler fan back into the header, it might indicate a fan failure warning. Most modern boards include this protection feature to safeguard the chip from overheating. Verify the fan is properly connected and matches the correct CPU fan header. If the chip was removed for work, it could be misaligned in the socket. Sometimes simply reinserting it resolves the issue, even without prior removal.
Consider taking out and repositioning the CPU next. Be cautious not to drop it if the board has pins secured in the socket—it could ruin everything. Sometimes just gently shaking the chip around without taking it off works, but you’ll still need to release the locking mechanism first. Avoid pressing down while doing this; instead, lightly shake it with your finger a few times, then reattach and finish adjusting the cooler’s TIM and mounting.