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We study the singular fractional-order boundary-value problem with a sign-changing nonlinear term -αx(t)=p(t)f(t,x(t),μ1x(t),μ2x(t),…,μn-1x(t)),0<t<1,μix(0)=0,1≤i≤n-1,μn-1+1x(0)=0,μn-1x(1)=∑j=1p-2ajμn-1x(ξj), where n-1<α≤n, n∈ℕ and n≥3 with 0<μ1<μ2<⋯<μn-2<μn-1 and n-3<μn-1<α-2, aj∈ℝ,0<ξ1<ξ2<⋯<ξp-2<1 satisfying 0<∑j=1p-2ajξjα-μn-1-1<1, α is the standard Riemann-Liouville derivative, f:[0,1]×ℝn→ℝ is a sign-changing continuous function and may be unbounded from below with respect to xi, and p:(0,1)→[0,∞) is continuous. Some new results on the existence of nontrivial solutions for the above problem are obtained by computing the topological degree of a completely continuous field

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