Learn why a system may fail to boot after installing a new GPU and how missing or improperly connected power connectors are often the cause, as required for the CompTIA A+ Core 1 220-1101 exam. Discover the importance of dedicated PCIe power for modern graphics cards.
Table of Contents
Question
A technician installs a new GPU, but the system fails to boot. What is the most likely cause?
A. The BIOS is outdated
B. The RAM is incompatible
C. The CPU is overheating
D. The GPU requires additional power connectors
E. The hard drive is failing
Answer
D. The GPU requires additional power connectors
Explanation
Many high-performance GPUs require additional power connectors from the PSU. If these are not connected, the system may fail to boot.
Many modern GPUs demand more power than the PCIe slot alone can provide. While the PCIe slot supplies up to 75W, high-performance graphics cards often require one or more dedicated PCIe power connectors (6-pin, 8-pin, or newer types) directly from the power supply unit (PSU). If these connectors are not attached, or if insufficient or improper cables (such as splitters or pigtails) are used, the GPU will not receive adequate power, and the system may fail to boot, show no display, or even prevent the motherboard from POSTing.
Manufacturers and industry experts recommend connecting each required PCIe power connector using separate cables from the PSU to ensure stable power delivery, especially for GPUs with high power requirements. This is a common troubleshooting step when a new graphics card causes boot failure, and it is supported by numerous user reports and technical forums.
Other potential causes—such as outdated BIOS, incompatible RAM, or overheating—may contribute to boot issues, but the most frequent and immediate cause after a GPU upgrade is missing or improperly connected power cables. Always verify that all required GPU power connectors are securely attached and, if possible, use dedicated cables rather than splitters to ensure reliable operation.
CompTIA A+ Core 1 220-1101 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the CompTIA A+ Core 1 220-1101 exam and earn CompTIA A+ Core 1 220-1101 certification.