did not establish her liability under the Guaranty, the burden of responding to the FDIC’s motion for summary judgment did not shift to her. If a moving party makes out a prima facie case that would entitle him to a directed verdict if uncontroverted at trial, summary judgment will be granted unless the party opposing the motion offers competent evidence showing that there is a genuine issue as to a material fact. First Nat. Bank of Arizona v. Cities Serv. Co., 391 U.S. 253, 289, 88 S.Ct. 1575, 1592, 20 L.Ed.2d 569 (1968). If the moving party presents sufficient evidence to entitle him to a directed verdict, the burden of producing evidence is shifted to the party opposing the motion. Porcelli v. Joseph Schlitz Brewing Co., 397 F.Supp. 889 (D.C.Wis.1975), aff'd, 530 F.2d 980 (7th Cir.1976). Moreover, “[a] party must move to strike an affidavit that violates Rule 56(e); if he fails to do so, he will waive his objection and in the absence of ‘a gross miscarriage of justice,’ the court may consider the defective affidavit.” Klingman v. Nat. Indent. Co., 317 F.2d 850, 854 (7th Cir.1963). An examination of the motion for summary judgment against Margaret Meyer reveals that the FDIC established, through the Wilson affidavit and supporting documents, the terms of the note, security agreements, and guaranty. The FDIC further proved that George Meyer had defaulted on the note, that Margaret Meyer was liable under the guaranty, and the amount due. We hold that the FDIC established a prima facie case to recover the amount due under the note. Thus, the burden shifted to Margaret Meyer either to file a motion to strike the Wilson affidavit or to file counter-affidavits, “set[ting] forth specific facts showing that there [was] a genuine issue for trial.” Fed.R.Civ.P. 56(e). Initially we examine the “Response” to the Wilson affidavit to determine whether it raised a genuine issue of material fact. An affidavit offered in response to a motion for summary judgment by persons having no personal knowledge of the matters attested to therein is insufficient to establish the existence of a genuine issue of material fact. Durovic v. Palmer, 342 F.2d 634, 637 (7th Cir. 1965); Fed.R.Civ.P. 56(e) (“Supporting and opposing affidavits shall be made on personal knowledge, shall set forth facts as would be admissible in evidence, and shall show affirmatively that the affiant is competent to testify to the matters stated therein.”). Moreover,
“mere allegations in the pleadings are insufficient to show that there is a tria-ble issue if the moving party has made the showing required by Rule 56(c). The burden on the nonmoving party is not a heavy one; he simply is required to show specific facts, as opposed to general allegations, that present a genuine issue worthy of trial.
In making this showing the opposing party must indicate how he will support his contention that issues of fact remain.
When the burden of showing the existence of a factual dispute shifts to the nonmoving party, he does not fulfill this obligation merely by asserting, by affidavit or otherwise, that a genuine issue exists for trial.... And, although the court should refrain from assessing the probative value of the material presented, evidence in opposition to the motion that clearly is without any force is insufficient to raise a genuine issue. Thus, neither frivolous assertions nor mere suspicions will suffice to justify a denial of summary judgment. Theoretical questions of fact, and disputes as to matters of form will not preclude summary judgment.”
10A Wright, Miller, & Kane, Federal Practice and Procedure, § 2727 at 146-69 (footnotes omitted).
A review of the “Response” reveals that Margaret Meyer alleged that she was “without sufficient information ... to admit or deny the allegations contained in [the Wilson affidavit] and demand[ed] strict proof thereof.” We hold that this response is insufficient to raise a genuine issue of material fact because it was not based on the personal knowledge of the affiant. If